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Luas permukaan = (keliling alas * tinggi) + 2 luas alas = (3.14*20) + (1256*2) = 62,8+2512 = 2574,8 cm2
2. Volume = luas alas . Tinggi prisma = (20*12*1/2) * 20 = 120*20 = 2400 cm3
Luas permukaan = (keliling alas * tinggi) + 2 luas alas = (20+12+16*20) + 2(120) = 960+240 = 1300 cm2
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