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Lseluruh= Lbalok + Lsegitiga1 + Lsegitiga2
= 20x12 + (1/2x14x12) + (1/2x20x14)
= 240 + 84 + 140
= 464 cm^2 (a)
no. 27
V = p x l x t
= 80 x 45 x 55
=198.000 cm^3 (d)