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mencari luas lingkaran keseluruhan
L= πr²
L= 22/7 x 21 x 21
L= 1.386 cm²
mencari luas 2/6 lingkaran
L2/6= L x 2/6
= 1.386 x 2/6
= 462 cm²
jawab: D
1386-462
924