a. trapesium = 2 x (7+11)x3 :2 = 54
pp atas= 7x20= 140
pp bawah= 11x20= 220
pp blkng= 20 x 3 = 60
pp depan = 20 x 5 = 100
jumlahkan : 54+140+220+60+100= 574 cm²
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a. trapesium = 2 x (7+11)x3 :2 = 54
pp atas= 7x20= 140
pp bawah= 11x20= 220
pp blkng= 20 x 3 = 60
pp depan = 20 x 5 = 100
jumlahkan : 54+140+220+60+100= 574 cm²