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14 + 20 + 30 + 51
115 cm
400 cm - (115x3)
400 - 345
55 cm [B]
33. 2 x LA + Jumlah luas sisi sejajar
2 x (10x13/2) + (15x13 + 15x13 + 15x10)
2 x 65 + 540
130 + 540
670 cm [C]