Geometry
posted by John on .
If the size of a rectangle's area is twice as large as the size of it's perimeter, and the length of one of its sides is 4.5, what is the length of the other side?

one side  4.5
other side  x
area = 4.5x
perimeter = 2x + 9
translate " size of a rectangle's area is twice as large as the size of it's perimeter " into
4.5x = 2(2x+9)
4.5x = 4x + 18
.5x = 18
x = 36
the other side is 36
check:
area = 4.5(36) = 162
perimeter = 2(4.5+36) = 81
is 162 twice 81 ??? Sure is !