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

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.

The correct answer is d, hope this