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V=πr²H
640π=r²10π /π
640=r²10/10
64=r²
r=8
d=8+8=16
d=16
V=640πcm3
p=?
V=πr2*H
640π=πr2*10 / podzielic na 10π
64=r2
r=8
8*2=16 cm
r- promień podstawy
d- średnica podstawy
d= 2r
640π=10πr² /: 10π
r²= 64 / √
|r|= 8 <=> r=8 ∨ r= -8 ; r> o
d= 2*8=16