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Luas segitiga 1 = Luas segitiga 2 = 0.5*2*3 = 3
Luas segitiga 3 = Luas segitiga 4 = 0.5*2*3 = 3
Luas arsir = Luas segi empat - 4*Luas segitiga
= 30 - (4*3) = 30-12 = 18 cm2