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πr²H=500π
r²H=500
r²×20=500
20r²=500 /÷20
r²=25 /√
r=5
Pc=2πr²+2πrH
Pc=2×π×25+2×π×5×20
Pc=50π+200π
Pc=250π
Odp. Pole całkowite wynosi 250π
h=20cm
v=pp*h
500π³=pp*20cm /20cm
500πcm³/20cm=Pp
25πcm²=pp
Pp=πr²
25πcm²=πr² /:π
25cm²=r² /:²
r=5