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jadi alas segitiga = 64/4 = 16
jadi luas segitiga = 1/2.27.16 = 216 x 4 = 864 cm2
sedangkan luas persegi panjang = 64 x 42 = 2688 cm2
jai luas yang diarsir = 2688 - 864 = 1824 cm2