1)
R = 1.5 S = pi * 1.5^2 = 2.25*pi = 2.25 *3.14 = 7.065 см2
R = 4 S = pi* 4^2 = 16 *pi = 16*3.14 = 50,24 см2
R = 3 S = pi *3^2 = 9* pi = 9*3.14 = 28,26 см2
2) R^2 = 1.5^2 = 2.25
R^2 = 4^2 = 16
R^2 = 3^2 = 9
4) S / R^2 = 7.065 / 2.25 = 3.14
S / R^2 = 50.24 / 16 = 3.14
S / R^2 = 28.26 /9 = 3.14