Respostas

2013-11-07T18:25:52-02:00
2πr = 62,8cm
r = 62,8/2
π
 ≅ 62,8/2.3,14
 ≅ 62,8/6,28
 ≅ 10cm.
2 5 2
2013-11-07T18:32:16-02:00
C=2.pi.R²
62,8=2.3,14.R²
62,8=6,28.R²
62,8/6,28=R²
10=R²
√¯ 10= R
3,16=R