Question

If triangle ABC defined by the coordinates A(1, 1), B(9, 1), C(1, 9) is dilated by a scale factor of 1 2 , with resulting vertex B' at (5, 1), what is the center of the dilation?

Answer 1

Answer: the answer is b (1, 1)

In this case, the center of dilation is a vertex of the original figure.  

The center of dilation is a fixed point in the plane about which all points are expanded or contracted.

Step-by-step explanation: