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2010-02-18T18:43:10+01:00
V=πr²h
Ф=12 cm
r=½Ф=6 cm

0,36π dm³= 360π cm³

360π=π*6²*h
360π=36πh
h=360π/36/π
h=10 cm

2.

πr²h=π(r/10)²*xh
πr²h=πr²/100*xh
x=πr²h*100/r²/h/π
x=100
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