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pertama yg putih dlu
luas = 10,5x10,5x22/7 = 346,5cm²
lingkaran yg kecil diarsir = 22/7x7x7 = 154cm²
lingkaran besar = 14x14x22/7 = 616cm²
Luas yg diarsir = 616 - 346,5 + 154 = 423,5 cm²