AB is a midsegment z = y = x = D 12 A z x 10 C 8 B y E AB is a midsegment z = y = x = D z A 60 100 x C y B 40 E BF is a midsegment z = x = y = D 30 z F x 18 C 12 B y E BF and AF is a midsegment x = w = z = y = D 17 A y Z F w C 11 B x E AB is a midsegment y = x = D A 2x - 8 30 C 20 B y + 2 E |