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= 20/2 x 15 + 3,14 x 100/2
= 300/2 + 314/2
= 614/2
= 307 cm²
b) Luas = (12+6)x10 + (12+6)x8/2
= 18 x 10 + 18 x 4
= 180 + 72
= 252 cm²