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Forming a cone from a circle 2017-04-15
From Tasha:
A sector of a circle subtends an angle of 216 degrees at the centre, If this sector is used to form a cone of vertical height ,8cm, calculate the base radius of the cone
Answered by Penny Nom.
The area and radius of a circle 2016-12-19
From india:
How do you find the radius of a circle if only the area is given to you?
Answered by Penny Nom.
Radius angle and arc length 2016-11-24
From pavidthra:
Length or arc 11 and angle of subtended 45.need to find a radius
Answered by Penny Nom.
A circle formed from bending a wire 2016-10-16
From Deszaree:
The same piece of a wire is bent to form a circle
calculate:
a, the radius of the circle
b, the area of the circle

Answered by Penny Nom.
The radius of a coffee cup 2016-09-12
From Brett:
What is inside radius, in centimeters of a coffee cup if it holds 350g of coffee when filled to a depth of 9.5 cm? Assume coffee has the same density of water, 1.00g/cm3. A numeric value is expected and not an expression.
Answered by Penny Nom.
A chord of a circle, the central angle and the radius 2016-01-26
From Nishan:
If chord length is given along with angle then how to calculate the radius.
Answered by Penny Nom.
The volume of a sphere 2015-04-30
From Cassidy:
How do you find the radius of a sphere that has volume 36pI?
Answered by Penny Nom.
The radius of a cylinder 2015-02-26
From Rose:
Hi. I want to know how to find the radius of cylinder.
When I have height (35cm) and area of the curved surface(880sq.cm).
I know the formula is 2πr(h+r). But I can't understand how to find it's radius.
Please help me. I really need your help.

Answered by Penny Nom.
The center and radius of a circle 2015-02-06
From ariana:
I need to find the center and the radius of this circle. I don't know how to put 9/2 than square it into a fraction.

x^2 + 2x + y^2 +9y=5

Answered by Penny Nom.
How does pir^2 = 1/4pid^2? 2014-10-14
From al:
Hi I cant work out the algebra. How does pir^2 = 1/4pid^2 Thanx
Answered by Penny Nom.
A cable around the Earth 2014-03-13
From fikile:
By how much must an equatorial cable be extended in order that it runs 1meter above the ground?
Answered by Penny Nom.
The length and depth of a chord 2012-08-16
From Tim:
Can I find the radius of a circle, if I have a chord of 2400mm, and a depth between the center of the chord and the perimeter of the circle of 150mm ?
Thanks
Tim

Answered by Penny Nom.
The radius of a circle 2012-01-12
From Janie:
Find the radius of a circle knowing that a chord of 24.6 inches has a corresponding arc of 70.
Answered by Penny Nom.
The circumference and area of a circle 2011-12-13
From Mable:
A circle that going 70mi across using 22/7 I need the area,radius, and the circumference and how to set up the steps can you help?
Answered by Penny Nom.
The radius of a cylinder 2011-04-27
From Jazmin:
Hi, I don't understand how to find the radius in a cylinder with only the surface area (143.7) and the height (0.8)? I know that the formula is 2pir2+2pirh, but I don't see how to isolate the r? I appreciate your help.
Answered by Penny Nom.
A 400 gallon drum 2010-11-04
From Jerry:
Question from Jerry:

I want to build A tank. able to hold 400 gallons of asphalt sealer it will be round . basically like A old fuel oil drum but made with heavy material . math ? was I want tank to hold 400 gallons I think the length of 60" would be perfect. I don't know what diameter or radius of tank needs to be . to make it A 400 Gallon tank

Answered by Harley Weston.
The distance from a chord to an arc 2010-02-11
From matt:
hello, I have to layout a radius without being able to pull from the center my radius is 3819.53 feet and i have a chord length of 275.59 feet if i broke that up into 25.05 feet sections how would i calculate the lengths from my chord to that radius?
Answered by Robert Dawson.
A tunnel from Toronto to Montreal 2010-01-25
From Dave:
I want to make a tunnel from Toronto to Montreal (for example)

Something like this http://mathcentral.uregina.ca/QQ/database/QQ.09.09/h/grant1.html
-------------
My coordinates are 45.442455,-73.861340 (Montreal) and 43.442455, -79.861340 (Toronto)

I need to know how to find arc distance, chord distance and radius What websites can i find for this subject Google has many but they are useless (blah blah) websites
LOL
Thanks

Answered by Chris Fisher and Robert Dawson.
The inradius of an icosahedron 2010-01-21
From fnavroth:
Suppose you have an equilateral triangle. The area of the triangle is exactly 1200 square centimetres. Now suppose you have twenty of those triangles. It's possible to assemble those twenty triangles into a closed three-dimensional shape, a regular polyhedron. What would be the volume, in cubic centimetres, of the largest sphere that could fit inside the shape?
Answered by Chris Fisher.
A question from a boat builder 2010-01-01
From Grant:
I am a boat builder, trying to lay out shape of side's elevation. My question is, how do I define the length of a circle's radius, if I know the chord length (20 ft) and the segment of the radius between the chord and the circle is known (7 inches)?
Answered by Penny Nom.
Chord length given the length & radius of an arc 2009-12-31
From Wayne:
Given the length & radius of an arc, is there a formula that will accurately calculate the chord length? I'm an architectural designer, and would need it explained in layman's terms. Thank you.
Wayne

Answered by Penny Nom.
Sagitta 2009-09-10
From Robert:
Can you please tell me if there is a formula to figure out the Sagitta of an arc when you know the radius, chord length, and arc length?
Answered by Chris Fisher and Harley Weston.
The layout of an arch 2009-08-18
From Steven:
I am trying to layout a large radius between 2 points in a building and need a formula to figure different senarios for example: radius is 187'6" distance between 2 points is 34'8" need points 16" apart along the line between the 2 points to create the radius please help
Answered by Stephen La Rocque.
The radius of an arc 2009-06-12
From Billy:
I have tried using the formula 4h2(squared)plus L2(squared)divided by 8h to find the radius of an arc, but I must be doing something wrong since I keep getting the wrong answer. Can you tell me what I am doing wrong. The height is 37.75 in. and the length is 18.875 in. Thank you for any help you can give me.
Answered by Stephen La Rocque.
The rate of change of the volume of a sphere 2009-03-25
From Kaylin:
why the rate of change of volume of a sphere is not constant even though dr/dt is constant?
Answered by Walter Whiteley.
The radius of a circle 2009-03-22
From Justin:
Find the radius of a circle with a circumference of 9.43cm.
Answered by Penny Nom.
The radius of a cone 2009-01-02
From kalpaj:
A conical funnel holds 100ml. If the height of the funnel is 10 cm, determine its radius, to the nearest tenth of a centimeter.
Answered by Penny Nom.
Finding the Distance Between Two Latitudes 2008-10-02
From Samua:
Assuming that the Earth is a sphere of radius 4000 miles and that the cities are on the same longitude (one city is due north to the other). Find the distance between the cities with the latitudes of 37 degrees 47'36'' and another city with 47 degrees 37'18''. Heeeeeeeeeeelp!
Answered by Janice Cotcher.
A string around the world 2008-08-18
From Terry:
I heard this on T.V. and was wondering if it was true. Place a string around the world, you would need 25,000 miles of string. If you raised the string off of the ground by 1 foot all the way around. How much more string would you need?
Answered by Penny Nom.
Arc-length and sector-angle 2008-08-06
From Benson:
If chord length, radius are given, How to find the sector angle and arc-length
Answered by Janice Cotcher.
Chords and arcs 2008-07-11
From Ronnie:
We are trying to build a semi life size ark decoration , and we are trying to cut the sides out . The curved sides and we can't figure our radius , all we know is that our chord length is 24ft. any suggestions on how to find the radius or maybe even the arc length or circumference or diameter?
Answered by Harley Weston.
CIRCLES 2008-07-07
From daryl:
Find the equation of the smaller circle that is tangent to the axes and the circle x(squared)+y(squared)=2x+2y-1?
Answered by Penny.
If the arc is 75mm, what is the radius? 2008-06-12
From malcolm:
If the are is 75mm, what is the radius?
Answered by Janice Cotcher and Harley Weston.
The radius of a sphere if you know the volume 2008-06-11
From Cey:
how to i find the radius of a sphere with a volume of 1000cm cubed using the formula v=4/3 pi r squared???????/
Answered by Penny Nom.
The radius of a circle 2008-04-25
From kathy:
How do you find the radius of a circle if the area is 803.84 and using 3.14 for pi.
Answered by Penny Nom.
Finding the radius when only given chord length 2008-04-03
From Lorraine:
There are two chords in a circle, an 8 inch chord and a 10 inch chord. The 8 inch chord is twice the distance from the center as the 10 inch chord. What is the radius?
Answered by Stephen La Rocque.
The radius of a circle 2008-03-22
From danny:
waht is the radius of a circle, if the circumference is 800?
Answered by Penny Nom.
The centre and radius of a circle 2008-03-12
From Ryan:
hello and thank you for such a wonderful service. This problem I think needs to be checked could you take a gander at it and tell me if i get it correct thanks find the center and the radius of this circle x^2+y^2=8x-2y+15=0 I cam up with center -2, 1/2 and a radius of 11 3/4
Answered by Harley Weston.
The radius of a circle 2008-02-28
From SteVonee:
Estimate the radius of a circle with the given circumference that is 192ft
Answered by Penny Nom.
I cut the cylinder at a 45 degree angle 2008-02-26
From Shannon:
I have a cylinder with a radius of 2' 1 5/8". How do I calculate the radius increase when I cut the cylinder at a 45 degree angle?
Answered by Harley Weston.
The circumference and radius of a circle 2008-02-10
From Ray:
How do you find the circumference or radius of an area presuming it is a circle. Or in other words how do you find the c or r given only the area is 50 sq metres
Answered by Penny Nom.
Finding the area of an isosceles triangle given one angle and the inradius 2008-01-24
From Saurabh:
Given an isosceles Triangle, whose one angle is 120 and inradius is √3. So area of triangle is?
Answered by Stephen La Rocque.
The radius of a planet 2008-01-06
From Ben:
Two people who are both h feet tall are standing on a spherical planet. One person walks a distance d in feet away from the the other person. At this point, the person walking turns around and can no longer see the top of the other persons head. What is the radius of the planet?
Answered by Stephen La Rocque and Harley Weston.
A radius and a tangent to a circle 2007-12-04
From elizabeth:
show that the radius of a circle meets a tangent line to the circle in a 90 degree angle. hint: start by assuming they are not perpendicular and at a contradiction.
Answered by Penny Nom.
Find the radius of a circle given the center and a point on the circle 2007-11-18
From Raymund:
Find the radius if the center is at (0, -5) and one point on the circle is (2,3)
Answered by Stephen La Rocque.
The radius of an arch 2007-11-10
From Mark:
How do you determine the raduis or diameter of a circle based on the folowing information:
1. The distance along the circle between two points is 35'-2". This creates an arch.
2. The (chord) distance between the two points is 30'-8".
3. The distance from the center of the chord (on a 90 degree) to the arch is 6'-10 3/4".

Answered by Harley Weston.
How do you find the radius of a circle if you only know its area 2007-10-15
From s:
how do you find the radius of a circle if you only know the area of the circle. Do you somehow reverse the Pi formula.
Answered by Penny Nom.
Given the arc length and chord length, what is the radius? 2007-10-10
From Wayne:
I have the actual length of an arc plus the length of the cord. How do I determine the radius of the arc.
Answered by Harley Weston.
Arc lengths, central angles and radii 2007-10-04
From Ashutosh:
Jose can remember that the length of an arc is 440cm, but he cannot remember the radius of the arc or the angle at the center. He does know that the angle was a whole number of degrees and the radius was less than 100cm. Find three possible angles and write down the size of each of the possible radii.
Answered by Stephen La Rocque.
Area of a circular garden 2007-06-18
From Cynthia:
Hi is this the correct formula for this problem? What is the approximate area of a circular garden that is 20 feet in diameters?
Answered by Stephen La Rocque.
Area of region between circle and inscribed octagon 2007-05-07
From amy:
I have to find the area of the shaded region where there is an octagon inscribed in a circle The radius is 4 inches. The shaded region is everything besides the octagon inside the circle. How can I find the area of the shaded region? Thank you!
Answered by Stephen La Rocque.
An arc shaped groove into a peice of metal 2007-04-12
From daniel:
hello i work at an engineering workshop the other night i was asked to machine an arc shaped groove into a piece of metal the cord length was 6 mm and the height from the middle of the cord to the arc was 1mm i was hoping to find the diameter of the cutter needed to do the job and also the formula to work out how to find the diameter. i believe it is 10mm dia thankyou for your time and knowledge
Answered by Stephen La Rocque.
The centre and radius of a circle 2007-01-27
From A student:
x^2+y^2=121 is the equation of the Circle C

(1) Write down the center and the radius of C.

Answered by Stephen La Rocque.
An arc, a cord and the radius of a circle 2007-01-14
From Kevin:
I have the length of the cord and the distance from the cord to the arc, is it possible to find the radius with just these parameters?
Answered by Penny Nom.
The radius of a hemisphere 2006-11-29
From Emma:
how do you calculate the radius of a hemisphere when you are given the volume?
Answered by Stephen La Rocque.
The radius of an arch 2006-11-15
From Kelly:
I am trying to achieve an arc height of .375 on the length of 17.375.
Answered by Penny Nom.
The radius of a cone 2006-09-08
From Hermanson:
I know the cone is 20 degrees at the top and 80 degrees at the bottom. What is the formula for finding the radius?
Answered by Stephen La Rocque.
Find the radius knowing the chord length and... 2006-07-28
From Jim:
If I know the length of a chord and its distance from the diameter, how do I calculate the radius of the circle?
Answered by Stephen La Rocque.
Three circles inside a larger circle 2006-04-16
From Meghan:
Given three congruent circles tangent to one another (radii = 1), what is the radius of a circle circumscribed around them?
Answered by Stephen La Rocque.
The centre and radius of a circle 2006-04-02
From Kaye:
I need to calculate Dimension E and F. I am given A, B, C, (or over all A+B+C), D, G. The radius is one continuous unknown radius. Example: A = 23.50
B = 35.50
C = 0.50
D = 11.50
G = 23.50
I have calculated this for angles but my mind is drawing a blank for the radius calculation. I can draw it but I need to put into Excel spreadsheet.

Answered by Harley Weston.
The diameter of a pipe 2006-01-27
From An other:

I know the base length of my arc (10 inches) - I also know the height at the center to the arc (2 inches). I don't think the end is at the midpoint tho. How do I figure out how long the arc length is?

My question involves being able to cut a round pipe into an arc that is 10 inches wide and 2 inches tall. I need to know the smallest diameter pipe to buy in order to fulfill these requirements.


Answered by Penny Nom.
Measuring an octagon 2006-01-26
From Travis:
I am looking to do a project for work where I must find the radius of an octagon but I cannot directly measure it. I've found that on a regular hexagon I can find the radius by using the distance between the bolts to find the radius to the line connecting the bolts but also to the outside of a circle to cut it out. I do not understand however how this works for an octagon. What do I do to find the radius of an octagon with only the ability to measure the distance of the bolts? The center has a cutout in it and is mounted currently and I cannot get accurate measurements.
Answered by Penny Nom.
How would I find the length of the radius? 2005-10-15
From Stace:
If given the length of a chord (121") and the distance from the midpoint of the arc to the midpoint of a chord (12"), how would I find the length of the radius?
Answered by Penny Nom.
What is the radius of this planet 2005-08-05
From Kelly:
Assuming that a North-South line has been established, you set up two camps that are 67 miles apart. You now set up poles at each camp perpendicular to the ground. On a certain day at "noon" the pole at the South camp casts no shadow, while at the North camp a shadow is cast. The shadow makes an angle of 89 degrees with the horizontal. What is the radius, diameter, and circumference of this planet?
Answered by Chris Fisher.
The radius of a circle 2005-01-18
From A student:
find the radius of a circle whose area is 1256sq cm.Use pi as an appoximation for pi.
Answered by Penny Nom.
A line from the center of the patch to the periphery 2005-01-01
From Sandrine:
I am currently researching a patch disease of grasses. These patches are roughly circular. I need a term for a line from the center of the patch to the periphery. Since the patches are not perfectly circular, my supervisors tell me I cannot use the word 'radius'. What else could I use?
Answered by Denis Hanson and Harley Weston.
The radius of a circle 2004-08-24
From Peter:
If you slice any circle with a line, and call the distance of the line between intersections the "y" length and the perpendicular length to the shorter side of the curve the "x" length, what is the resulting equation for the radius?
Answered by Penny Nom.
The circle through three points 2004-07-06
From Jim:
I am a student trying to solve math problem. I'd like to calculate the radius of the circle that exactly fits any three points. If the points are (X1,Y1), (X2,Y2), and (X3,Y3), what is the radius of the circle that contains those three points?
Answered by Penny Nom.
The radius of a circle 2004-03-06
From A student:
what is the radius of a circle with the circumference of 12 inches?
Answered by Penny Nom.
Circumference 2003-05-09
From A parent:
Find the circumference use 3 1/7 for pi

1. r= 28 ft.
2. D=98 cm

Answered by Penny Nom.
Surface area of a sphere 2003-03-11
From Kim:
a sphere has a surface area of 128 pi sq. units. What is its exact radius?
formula is 4 pi r2 I believe but how do I get radius

Answered by Penny Nom.
Wrap a rope around the equator 2003-02-12
From Ali:
If you take a rope and wrap it around the equator and then overlap it 6ft. and cut off the extra then you loosen it up so the ends meet how far would it stand off the ground?
Answered by Penny Nom.
The length of an arc 2002-11-27
From Nancy:
If all I have is the length between 2 ends of an arc (72"), how do I find the length of the arc at its apex and the radius?
Answered by Penny Nom.
How would you find the length of the chord? 2002-10-31
From A draftsperson:
If given the length of an arc and the distance from the midpoint of the arc to the midpoint of a chord, how would you find the length of the chord and the radius of the arc. The chords endpoints are the same as the the arcs endpoints.
Answered by Penny Nom.
A Circle is evenly divided into six equal triangles 2002-09-16
From Marilynn:
A Circle is evenly divided into six equal triangles leaving an area between the outside of the circle and the one side of the triangle. This area is measured as 3.14. What is the length of the radius, one line on the triangle?
Answered by Paul Betts.
Diameter of a pipe 2002-02-16
From Landry:
I am trying to calculate the dia. of a pipe 60 inches long that will hold a gallon of water. What is the formula?
Answered by Penny Nom.
The radius of a planet 2001-07-30
From Jessica:
A satellite is orbiting the earth at an altitude of 100 miles. If the angle of depression from the satellite to the horizon is 50 degrees, what is the radius (to the nearest mile) of the planet?
Answered by Harley Weston.
A chord length 2000-10-17
From Al Paas:
How to determine the length of a chord given the diameter of the circle and the maximum distance from the chord to The circle?
Answered by Chris Fisher.
A problem with a radius. 2000-02-01
From Howard B Davis:
We start a Line that goes up 1 unit, then it goes to the Right for 5 units long, and then goes down 1 unit which is the end point. If we draw a circle that is tangent to both ends as well as the mid-point of the horizontal line: How do we find the radius of the arc; in Mathematics, with only this information?
Answered by Chris Fisher.
The circumference of a circle 1999-10-05
From Mara Frost:
what is the formula to find the circumference of a circle, or if there is no formula, how do you find the circumference of a circle?
Answered by Penny Nom.
Radius of an arc 1999-04-22
From Rusty Riddleberger:
I need to find the equation for finding the radius of an arc; I know the length of the arc (i.e the distance of the line connecting the two ends of the arc) and the height; (i.e the rise of the arc at its apex,) I had the formula years ago but it has lost me; this would be invaluable for work in new homes i.e. where we need to build an "arch" with a rise of 21" between two columns 11 feet apart
Answered by Chris Fisher.
Radius of convergence 1999-04-21
From Nowl Stave:
Why is the radius of convergence of the first 6 terms of the power series expansion of x^(1/2) centered at 4 less than 6?
Answered by Harley Weston.
Circles 1999-04-21
From Alex Elkins:
How do you find the circumference of a circle if you only know the radius and the square feet or inches of the circle if the radius is 18 inches, If done in inches do you multiply by 12 to get the square feet?
Answered by Jack Lesage and Harley Weston.
Pi 1997-10-31
From Ryan McKinnon:
What Is Pi?
Answered by Chris Fisher.
A tangent to a circle is perpendicular to the radius at the point of contact. 1996-10-22
From Rita Leung:
I wonder if there is any proof for this theorem - A tangent to a circle is perpendicular to the radius at the point of contact. If there is any proof for that, can you tell me please?
Answered by Chris Fisher and Harley Weston.
 
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