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616 = 22/7 x r²
r² = 616 x 7/22
= 196
r = √196 = 14
r₂ = 2 x 14 = 28
L₂ = 22/7 x 28 x 28
= 2464 cm²
14×2=28
22/7×28×28=22×4×28=2464
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