panjang segitiga BC = 50cm dan AC = 30 .Hitunglah : (a) panjang AB (b) luas segitiga ABC (c) panjang AD

A. AB^2= BC^2 - AC^2
= 50^2 - 30^2
= 2500 - 900
AB = √1600
AB = 40 cm
B. L= 1/2 ×a×t
= 1/2×40×30
= 20×30
= 600 cm^2