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d = 8 maka r = 4
Luas A = π x r² = 3,14 x 4² = 50,24 cm²
luas 50A = 50 x 50,24 = 2512 cm²
lingkaran B
d = 20 maka r = 10
Luas B = π x r² = 3,14 x 10² = 314 cm²
2512/314 = 8
jawaban nya : A. 8