representing tranformation

Question

Polygon ABCD is translated to create polygon A′B′C′D′. Point A is located at (1, 5), and point A′ is located at (-2, 1). What is the distance from B to B′ ? 

Answer 1

The distance from A to the translated point A' is √ [(-2-1)² + (1-5)²] = 5

So, the distance from B to its translated point B' is also 5.