A(-1,1) B(1,5), C(3,1) are the vertices of triangle ABC. if M is the midpoint of BC, find BM

Answer 1

length of BC
= √( (5-1)^2 + (1-3)^2)
= √(16+4) = √20
= 2√5

since BM = (1/2)BC
BM = √5