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Perimeter |
2002-06-05 |
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From Tava:
I'm a grade four student from St. Mary school. In class we've been dicussing perimeters. So this is what we did; First we each got a piece of paper in the shape of the geoboards and our teacher told us to find as many different shapes of area of 12 square units. During this time we were given to find perimeters of shapes that had twelve square units one of our classmates discovered the biggest perimeter possible with twelve square units of 26 units. Another classmate discovered the smallest perimeter of fourteen units. Here's a question: Why are all the shapes with fourteen units all the same shape? and why are all the shapes with twenty-six units can be different? After we found the biggest and smallest shapes our teacher told us we each had to find at least one shape of the biggest and smallest. After we each foud a shape with a perimeter of twenty-six and fourteen we had to find different shapes with different perimeters. During that time we discovered different perimeters. What we found was fourteen all the way up to twenty-six, but they all went by two's. Why didn't they count up by 14, 15, 16, 17, 18 etc? I think it's because the area is an even number. See if you added one "block" or "square" to it you always add three because at least one of the sides is together with another side. Whyare all the perimeters all even numbers?
Answered by Penny Nom. |
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A polynomial |
2002-06-05 |
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From Melissa:
I'd like to know what is a polynomial( the definition and an explication)? And is 7x a polynomial? and why?
Answered by Penny Nom. |
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The area of a circle |
2002-06-03 |
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From Jessica:
I am doing a maths assigment for university, which is aimed towrds primary school students(k-6). I was wondering if you could give me some information as to how I could describe to students the rule for finding the area of circle, using a circle cut up into equal sectors (like a pizza). I know it has something to do with the fact that you can make these shapes into a parallelogram, but I am a bit uncertain as to how I can express this idea clearly and articulately to students.
Answered by Penny Nom. |
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Ratios and weights on Neptune |
2002-06-03 |
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From Janice:
The ratio of an object's weight on earth to it's weight on Neptune is 5:7. How much would a person who weighs 150 pounds on earth weigh on Neptune.
Answered by Penny Nom. |
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Ounces and cubic centimeters |
2002-05-30 |
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From Martin:
How many ounces are in 600cc of liquid?
Answered by Penny Nom. |
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11........1 |
2002-05-29 |
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From Un eleve:
Démontrer que tout nombre impair non multiple de 5 admet un multiple de la forme:11........1
Answered by Claude Tardif. |
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Conics |
2002-05-29 |
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From Brooke:
Which conic cannot be generated by an intersection of a plane and a double napped cone?
Answered by Chris Fisher. |
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Overlapping circles |
2002-05-29 |
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From Naman:
There are two circles, big circle with radius R and small one with radius r. They intersect and overlap in such a way that the common area formed is 1/2 pi r 2 (half the area of the small circle) If r=1, find the Radius of the big circle (R)?
Answered by Harley Weston. |
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La traduction anglais |
2002-05-27 |
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From Une etudiant:
je voudrais savoir la traduction anglais de :
homothétie (mot de niveau intermédiaire (6-9))
apothème (mot de niveau internédiaire (6-9))
parce que je ne les trouve pas.
Answered by Chris Fisher at Claude Tardif. |
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The sum of the areas of two regular decagons |
2002-05-27 |
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From A parent:
The sum of the areas of two regular decagons is 39 square inches, and their radii are in the ratio of 2:3. Find the area of the larger decagon.
Answered by Paul Betts. |
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Linear programming |
2002-05-27 |
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From Jes:
A machine shop makes two parts, I and II, each requiring the use of three machines, A, B, C. Each Part I requires 4 minutes on Machine A, four minutes on Machine B and five minutes on machine C. Each Part II requires five minutes on Machine A, one minutes on Machine B and six minutes on Machine C. The shop makes a profit of $8 on each Part I and $5 on each Part II. However, the number of units of Part II produced must not be less than half the number of Part I. Also each day the shop has only 120 minutes of machine A, 72 minutes of Machine B, and 180 minutes of Machine C available for the production of the two parts. What should be the daily production of each part to maximize the shop's profit?
Answered by Claude Tardif. |
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Cubic feet and cubic yards |
2002-05-27 |
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From John:
how do you find the cubic feet/cubic yard of area 10 feet wide by 15 ft long by 2 inches high
Answered by Penny Nom. |
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One-fourth of a number is added to one-third of the same number |
2002-05-26 |
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From A student:
When one-fourth of a number is added to one-third of the same number, the result is 28. What is the number?
Answered by Penny Nom. |
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A spotlight shines on a wall |
2002-05-25 |
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From Barb:
A spotlight on the ground shines on a wall 12m away. If a man 2m tall walks from the spotlight toward the bldg at a speed of 1.6 m/s, how fast is his shadow on the bldg decreasing when he is 4m from the bldg?
Answered by Penny Nom. |
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A schedule for 24 golfers |
2002-05-25 |
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From John:
I am working on a schedule for 24 golfers. 6 groups of 4. I have 8 golf days (twice per week for a month). Ideally, I would like to schedule all 24 golfers in 6 different groups of 4 on each day. Here is the catch.....no golfer in any group can be grouped togther more than once. Every group of 4 each day will have 4 new golfers that have never played together before. Is this possible?
Answered by Chris Fisher. |
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