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P=1/2*4*pi*4*4 + 4*4*pi*=48pi
r- 4cm
P= 4 pi r kwadrat
P= 4 x pi x 4kwadrat= 4xpix16 = 64pi
czyli pole półkuli to 1/2 Pola Kuli
1/2 P= 1/2 x64pi= 32pi
Pp = 4πr^2/2 + πr^2 = 2*16π + 16π = 48π ≈ 150,72 cm2