mohon bantuannya beserta caranya :)

t jajargenjang = akar (13^2 - 5^2) = akar(144) = 12

L jajargenjang = axt = 20x12 = 240 cm
L layang2 = 1/2xd1xd2=1/2×10×24 =120 cm
L total = 240+120 = 360 cm