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luas prisma = luas alas+luas selimut=½.8.3+4.9.5=12+180=192cm²
volume=luas alasxtinggi=½.8.3.9=108cm³
b.)sisi miring=√7²+6²=√49+36=√85
luas prisma=luas alas+luas selimut=½.6.7+6.9+7.9+√85.9=21+54+63+9√85=138+9√85 cm²
volume=luas alasxtinggi=½.6.7.9=189cm³