1. S = π* R^2
S = 3.14 * 3.5^2 = 38.465
2. C = 2*π*R
S = π*R^2
R = C / 2*π
R = 20.7 / 2 * 3.14 = 20.7 / 6.28 = 3.3
S = 3.14 * 3.3^2 = 10.89
3. C = 2* π* R
S = π* R^2
D = R/2
R = C / 2* π
R = 4.1
D = 2.05
S = 3.14 * 4.1^2 = 52.7834
1. S = π* R^2
S = 3.14 * 3.5^2 = 38.465
2. C = 2*π*R
S = π*R^2
R = C / 2*π
R = 20.7 / 2 * 3.14 = 20.7 / 6.28 = 3.3
S = 3.14 * 3.3^2 = 10.89
3. C = 2* π* R
S = π* R^2
D = R/2
R = C / 2* π
R = 4.1
D = 2.05
S = 3.14 * 4.1^2 = 52.7834