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v limas = 1/3 x L.a x t
= 1/3 x 7 x 7 x 10
= 1/3 x 490
= 163 cm³
no 9
v prisma = L.a x t
= 1/2 x 20 x 8 x 15
= 10 x 8 x 15
= 80 x 15
= 1200 cm³
solusi
luas alas:20÷2×8:80
tinggi:15
hasil:80×15:1200