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volume = luas alas x TP
= ( 2 x ( 8+ 20)/2 x 5)) x 6
= 28 x 5 x 6
= 840 (C)
luas = 1/2 x (a+b) x t
= 1/2 x (8 + 20) x 5
= 70 cm²
= 70 x 2
= 140 cm²
volume = 140 x tinggi prisma
= 140 x 6
= 840 cm³(C)