 |
 |
 |
 |
 |
 |
 |
 |
Two line segments in the plane |
2011-08-15 |
 |
From Tim: For this problem I actually have tried to visualise the image in my head many times. This question makes my head spin.
Four points lie in a plane. They are partitioned into two pairs so that the sum of the lengths of the segments joining the points of each pair has the minimal possible value.
Prove that these segments have no common points. Answered by Chris Fisher. |
 |
 |
 |
 |
 |
A cyclic quadrilateral |
2011-08-15 |
 |
From Tim: Hi! I've been working on this for a while and I'm quite stuck. If anyone can help that would be great.
The sides BC and AD of a quadrilateral ABCD are parallel. A circle meets the side AB at B and E and the side CD at C and F. Prove that the quadrilateral AEFD is cyclic. Answered by Chris Fisher. |
 |
 |
 |
 |
 |
A sequence |
2011-08-14 |
 |
From intesar: how do i figure this out 0,1/6,2/9,3/12 Answered by Penny Nom. |
 |
 |
 |
 |
 |
The third term of a sequence |
2011-08-13 |
 |
From sammantha: Find the 3rd term of the sequence, an=1.5(4)n - 1. Answered by Penny Nom. |
 |
 |
 |
 |
 |
A ratio as a fraction in lowest terms |
2011-08-12 |
 |
From jonecia: write this ratio as a fraction in lowest terms 707days of 112days? Answered by Melanie Tyrer. |
 |
 |
 |
 |
 |
50,000 cubic yards of dirt |
2011-08-12 |
 |
From JUDY: IF MY HUSBAND HAS A JOB THAT REQUIRES HIM TO MOVE 50,000 CUBIC YARDS OF DIRT, HOW MUCH LAND WOULD THAT COVER AT 1 FOOT DEPTH. Answered by Penny Nom. |
 |
 |
 |
 |
 |
Infinite Logarithmic Series |
2011-08-08 |
 |
From Sourik: Dear Expert,
In my Amithabha Mitra and Shambhunath Ganguly's "A Text Book of Mathematics" I found the formula of log (1+x) where the base is e and x lies in between -1 and +1.As I want to learn Mathematics,I am not satisfied with the mere statement of the formula.Please help giving me the full proof.
Thanking you,
Sourik Answered by Robert Dawson. |
 |
 |
 |
 |
 |
A concrete octagonal pad |
2011-08-04 |
 |
From Tina: I have a project where I need to construct a concrete octagonal pad. Each side is 12' and it is 5" deep. Please tell me how to calculate square yards of concrete. Thank you. Answered by Penny Nom. |
 |
 |
 |
 |
 |
A 3 foot circle using 1/2" cord |
2011-08-04 |
 |
From Cindy: To make a 3 foot circle using 1/2" cord - how many lineal feet of cord
do I need? Answered by Robert Dawson. |
 |
 |
 |
 |
 |
A lock box |
2011-08-03 |
 |
From Tom: I need to open a lock box from my parent's estate. The combination is a simple 4 number lock. The last two numbers are 33. Numbers can be used more than once.What are the possible combinations?
WP Answered by Harley Weston. |
 |
 |
 |
 |
 |
Ben's favourite numbers |
2011-08-03 |
 |
From Luke: Ben challenges you to guess his favourite numbers by using the following three clues:
-Each number is a four-digit odd number.
-Each is a palindrome
-The digits of each number add up to 10
-None of the numbers are divisible by 5 Answered by Robert Dawson. |
 |
 |
 |
 |
 |
A cone with an oval as a base |
2011-08-03 |
 |
From Emily: Hi, I was wondering how to calculate the surface area of a cone with an oval as a base (which I think is referred to as an elliptic cone or something like that). I have the both the maximum and minimum radius as well as the height, but I don't have a slant height and I'm not sure how to calculate it and then calculate surface area. I would really appreciate some help. Thanks! Answered by Robert Dawson. |
 |
 |
 |
 |
 |
A point on a circle |
2011-08-02 |
 |
From George: I know the center location (x,y) of the circle, I know the radius of the circle, I know the location (X,Y) of one point on the circle, and I know the angle (in degrees not radians) between the known point location (X,Y) and an unknown point location (let's call it (A,B) for reference). What formula(s) can I use to find out the coordinate position of (A,B)? Answered by Chris Fisher. |
 |
 |
 |
 |
 |
A trapezoid |
2011-08-02 |
 |
From Nazrul: How can I draw a trapezoid whose parallel sides and other two sides are given. Answered by Chris Fisher. |
 |
 |
 |
 |
 |
An equation in the form Ax+By=C |
2011-07-28 |
 |
From Mike: I need to write an equation in the form Ax+By=C
The points I was given are (5,0) and (-3,5)
I know how to find the slope I got -5/8 and wrote it out as y=(-5/8)x+b however I'm not quite sure where to go from here.
Any help would be greatly appreciated. Answered by Penny Nom. |
 |
 |