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r²=25cm²
r=√25cm²
r kuli=5cm
v=⁴/₃πr³=⁴/₃π×5³=⁴/₃π×125=⁵⁰⁰/₃πcm³=166 ⅔πcm³= objętośc tej kuli.
V= ?
Pp=4πr²
4πr²=100π
4r²=100
r²=25
r =5 [cm]
V = 4/3πr³
V= 4/3π *5³ = 4/3 *125 π= 500/3 π [cm³]