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= 1/2 x 20 x 21 x 30
= 10 x 21 x 30
= 21 x 300
= 6300 cm³
= 20.21 :2
= 210 cm²
tinggi prisma = 30 cm
Maka Volume = L alas x tinggi prisma
= 210 x 30
= 6300 cm³