Geometry/Experts

Recent Answers

2010-02-08 Area of Triangle Using Semiperimetre:

Hi Jillian! The subject line doens't match the question, and that has me confused. I'm nearly certain this problem depends on the shape of the triangle. There is a formula for finding the area of

2010-02-04 algebra:

We start with 64 people. Now 1/8 of the people is 8 people, so 3/8 of the peopleis 3*8 = 24. Since 3/8 of the people left, we have 64 - 24 = 40 people left. It then states 1/5 of the people leave

2010-02-03 Rectangles and Area:

The smallest area can be found with calculus to be a square. Let w be the width. Since the area is 225, this makes the length 225/w. The total fencing is then F(w) = 2w + 2*225/w = 2w + 450/w.

2010-01-28 Vectors - Dot and Cross Products:

Hi Zaheer! The dot product (aka scalar product) results in a scalar quantity. 2 vectors are combined and the result is a number that is the sum of the products of the like components. A "regular number"

2010-01-28 Diagonals:

Note that the diagonal can't be drawn to the same corner or either adjacent corner. The number of corners left is n-3, so that total is n(n-3), but that counts them all twice, since there is a point