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7. L = π . r² = 3,14 . 15² = 3,14 . 225 = 706,5 cm²
8. L = π . r²
616 = 22/7 . r²
616 . 22 = 7 . r²
13552 = 7 . r²
13552/7 = r²
1936 = r²
√1936 = r
44 = r