Xa = (Xe+Xf)/2 = (-4+8)/2 = 2
Ya = (Ye+Yf)/2 = (7-3)/2 = 2
A(2,2)
DA^2 = (2-1)^2 + (2-5)^2 = 1 + 9 = 10
DA = sqrt(10)
Xa = (Xe+Xf)/2 = (-4+8)/2 = 2
Ya = (Ye+Yf)/2 = (7-3)/2 = 2
A(2,2)
DA^2 = (2-1)^2 + (2-5)^2 = 1 + 9 = 10
DA = sqrt(10)