Triangle D has been dilated to create triangle D′. Use the image to answer the question.

Question

Triangle D has been dilated to create triangle D′. Use the image to answer the question.

image of a triangle labeled D with side lengths of 3.8, 4.8, 4.2 and a second triangle labeled D prime with side lengths of x, 2.4, 2.1

Determine the scale factor used.

one half
2
one fourth
3

Answer 1

The scale factor used is 2. This can be determined by comparing the corresponding side lengths of the original triangle D to the dilated triangle D'. For example, the side length of 4.8 in triangle D corresponds to a side length of 2.4 in triangle D', which is half the size.