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V calej kuli=4/3* pi* r do 3
4/3 pi* 54pier z 2/8=4pi*18 pier z 2/8=72pier z 2 pi/8=9 pier z 2 pi
pole powierzchni całej kuli to :
p=9 pi *2=18pi
r do 2=9/2
r=3 pie z 2/ przez 2
albo p polkuli=3pi*r do 2
Pc=9pi
9pi=3pi *r do 2 /3pi
r do 2 = 3
r=pier z 3
Pkuli=4 pi r do 2= 4pi * 3=12pi
Vkuli=4/3 pi* r do 3= 4/3 pi *3 pier z 3=4 pier z 3 pi