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alas = 10 x 15 = 150 cm
atap = 4x 15 = 60 cm
2 penutup samping = 5 x 15 x 2 = 150 cm
2 trapesium = 4+10 x 4 x 2 = 56 cm
2
luas seluruhnya = 150 + 60 + 150 + 56 = 416 (c)