D = 12, π ≈ 3,14.
D = 2R, откуда R = D : 2 = 6.
a) C = 2πR ≈ 2 · 3,14 · 6 = 37,68.
б) S = πR² ≈ 3,14 · 6² = 3,14 · 36 = 113,04.
Ответ: 37,68 и 113,04.
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D = 12, π ≈ 3,14.
D = 2R, откуда R = D : 2 = 6.
a) C = 2πR ≈ 2 · 3,14 · 6 = 37,68.
б) S = πR² ≈ 3,14 · 6² = 3,14 · 36 = 113,04.
Ответ: 37,68 и 113,04.