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2. L = r² = 3,14 x 15 x 15 = 47,1 x 15 = 706,5 cm²
= 3,14 x 31,5²
= 3,14 x 992,25
= 3115,665 cm²
2. L = π x r²
= 3,14 x 15²
= 3,14 x 225
= 706,5 cm²