Ответ:
S = 3,14 * r²
S = 3,14 * 19,5 * 19,5 = 1193, 985 ≈ 1194 см²
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Ответ:
S = 3,14 * r²
S = 3,14 * 19,5 * 19,5 = 1193, 985 ≈ 1194 см²