Question

Octagon ABCDEFGH and its dilation, octagon A'B'C'D'E'F'G'H', are shown on the coordinate plane below:

If the center of dilation is at the origin, by what scale factor was octagon ABCDEFGH dilated?

A: 4
B: 1/4
C: 1/2
D: 2

Guess: A

Answer 1

You can look at one of the points and see what happened to their x and y values. I'm going to take a look at point H.

It went from (2, 6) to (1, 3). This is a dilation factor of 1/2 because notice that you have to multiply the values (2, 6) by 1/2 to get (1, 3). So, your answer is C, and not A.

Answer 2

its not 1/2 - I got it wrong.