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sehingga persegi panjang berukuran 24 x 10 = 240
luas persegi panjang diatas persegi dg ukuran 6 = 6 x 4 = 24
luas segitiga yg bawah = 16 x 6 / 2 = 48
luas segitiga yg atas = 18 x 10 / 2 = 90
sehingga luas yg diarsir = 240 - (24+48+90) = 78 cm^2