14 cm.
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3.5 cm
circumference of a circle = 2*pi*radius or diameter*pi
C=2 pi R
The volume of any cylinder can be found by multiplying the value of Pi by the radius squared, then multiplying by the height. Since you didn't specify whether the 7cm measurement was the radius or diameter - you will have to do the calculations yourself based on the information in this answer !
A circumference of 21.99 cm