Ответ:
S = 4πr2
S=π(2r) ²
S=πd²
S=3.14*(19,12)²≈1147,90см²
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Ответ:
S = 4πr2
S=π(2r) ²
S=πd²
S=3.14*(19,12)²≈1147,90см²