20 = 2pr
r = 20/2/p=10/p
V = 1/3 * S(осн) * H
H = 1.2
S(осн) = p* (10/p)^2
V = 1/3 * p* (10/p)^2 *1.2 = 12.7(м^3)
20 = 2pr
r = 20/2/p=10/p
V = 1/3 * S(осн) * H
H = 1.2
S(осн) = p* (10/p)^2
V = 1/3 * p* (10/p)^2 *1.2 = 12.7(м^3)