math
posted by Cindy on .
A wooden pyramid, 12 inches tall, has a square base. A carpenter increases the dimensions of the wooden pyramid by a factor of 5 and makes a larger pyramid with the new dimensions. Describe in complete sentences the ratio of the volumes of the two pyramids.

v = 1/3 * s^2 * h
multiply dimensions by 5:
V = 1/3 * (5s)^2 * (5h)
= 1/3 * 25s^2 * 5h
= 1/3 *25s^2 * 5h
= 125 * 1/3 * s^2 * h
= 125v
multiplying the dimensions of a figure by k causes
length to multiply by k
area by k^2
volume by k^3