+39 Find the lengths of the medians of the triangle with vertices A(-3,5), B(2,4) and C(-1,-4)
A(x1, y1) B(x2, y2)
MAB=([x1+x2]/2, [y1+y2]/2)
=([-3+2]/2, [5+4]/2)=D(-1/2, 9/2)
dza=sqrt([x2-x1]2+[y2-y1]2)
dCD=sqrt([3/2]2+[17/2]2)=sqrt(9/4+289/2)=sqrt(298/4)=sqrt(298)/2
MBC=E(3/2,0)
dAE=sqrt([-3/2]2+52)=sqrt(109/4)=sqrt(109)/2
MAC=F(-1, 1/2)
dBF=sqrt(32+[7/2]2)=sqrt([36+49]/4)=sqrt(85)/2
