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= ¾ x 12 x 18
= 36/4 x 18
= 9 x 18
= 162 cm²
2) Luas
= (10 x 4) + (15-10) x (2+2+4)/2
= 40 + 5 x 8/2
= 60 cm²
3) Luas
= 6 x 10 + 3,14/2 x 6²
= 60 + 1,57 x 36
= 60 + 56,52
= 116,52 cm²