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Luas seperempat lingkaran = 1/4 . 22/7 . 10,5 . 10,5
= 86,625 cm
Luas segitiga = 10,5 . 10,5 / 2
= 55,125 cm
Luas yg diarsir = 86,625 - 55,125
= 31,5 cm