Question

The dimensions of a rectangle

are 6 inches by 9 inches. If the
rectangle is dilated by a scale
factor of 3 to create a new
rectangle, what is the perimeter
of the new rectangle?

Answer 1

102

Explanation:

Dilation is essentially enlarging each side.

So we can multiply 6 by 3 and 9 by 3 to get the side lengths of our rectangle:

6 x 3 = 24; 9 x 3 = 27

Now, we also know that the perimeter of a triangle is:

P = 2(l + w)

So:

2 (24 + 27) = 102