L= 1/4 πd²
49= 1/4 × 22/7 × d²
49= 22/28 × d²
1372/22 = d²
√1372/22 = d
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L= 1/4 πd²
49= 1/4 × 22/7 × d²
49= 22/28 × d²
1372/22 = d²
√1372/22 = d