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luas sisinya = 2 x 1/2 x 32 x 20 + 2 x 1/2 x 18 x 15 = 640 + 270 = 910
luas semuanya = 1486
s1 = 20 cm
s2= √9² + 12²
s2= 15 cm
Lp = La + Ls
Lp = (32 . 18) + (a . t /2) * t = s1 + (a . t /2) * t = s2
Lp = 576 + 32 . 20 / 2 + 18 . 15/2
Lp = 576 + 320 + 135
Lp = 1031 cm²