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La = 15 x 10 = 150 cm²
Keliling alas prisma:
K = 2(15 + 10) = 50 cm
Luas permukaan prisma:
Lp = 2 La + K.T
900 = 2 x 150 + 50.T
900 = 300 + 50T
50T = 600
T = 12 cm
Jadi tinggi prisma adalah 12 cm