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r²=6,25
r=2,5cm
R=2r=5cm
h=x
d=x+2
(x+2)²=5²+x²
x²+4x+4=x²+25
4x=25-4
4x=21
x=21:4
x=5,25=h walca
v=6,25π×5,25=103,03125cm³= około 103,03cm³