Question

What is the center of dilation? How do you know?

Answer 1

A

Explanation:

You want the center of dilation when ∆ABC is dilated by a factor of 1/2 to get ∆AED.

Center of dilation

In any dilation, the center of dilation is invariant. It doesn't move.

Since point A is common to both triangles, it didn't move. Point A is the center of dilation.