S = πR²
π≈3.14
12.56 = 3.14 *R²
R² = 4
R=2 (ед)
C = 2πR
C≈ 2*3.14*2≈4*3.14
C≈12.56 (ед)
d = 2*R
d = 2*2 = 4 (ед)
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Verified answer
S = πR²
π≈3.14
12.56 = 3.14 *R²
R² = 4
R=2 (ед)
C = 2πR
C≈ 2*3.14*2≈4*3.14
C≈12.56 (ед)
d = 2*R
d = 2*2 = 4 (ед)