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= a × t/2 × tp
= 20 × 12/2 × 36
= 20 × 6 × 36
= 20 × 216
= 4.320 cm^3 (b)
= (1/2 x a x t) x t prisma
= (1/2 x 20 x 12) x 36
= 120 x 36
= 4320 cm³