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′ ?

Translated
so the distance from A to A' should be the same as form B to B'

distance formula
distance between (x1,y1) and (x2,y2) is


so distance between (1,5) and (-2,1) is






the distance is 5 units