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luas permukaan = 2 x luas alas + keliling alas x tinggi prisma
520 = 2 (1/2 x 8 x 15) + (8+15+17) x tp
520 = 120 + 40.tp
520-120=40tp
400=40tp
tp=400/40 = 10 cm
volume= luas alas x tinggi