math geometry for high school

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

You can use the distance formula to find the distance between these 2 points. The distance between B and B" will be the same.

d = √(1-(-2))²+(5-1)²

d = √(3)²+(4)²

d = √(9+16)

d = √25

d=5