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= 1/4.22/7.21.21 - (12.12 - 1/4 luas lingkaran)
= 693 / 2 - (441 - 693/2)
= 693 / 2 - (882/2 - 693-2)
= 693/2 - 189/2
= 504/2
= 252 cm²
maaf kalau salah hitung