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Luas 1/2 lingkaran = 1/2 × 22/7 × 280 × 280
= 11 × 40 × 280 = 123.200
Luas lingkaran = 22/7 × 280 × 280 = 22 × 11.200 = 246.200
Hasil = 246.200 - 123.200 = 123.000 × 1,4 = 172.200 cm ---> 172,2 m