49 square cm
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you have to do 7 squared + 13 squared = x squared. 7 squared is 49 + 13 squared which is 169. 169+49=x squared. 218= x squared. The square root of 218 is about 14.765. So the answer should be about 15cm if the missing side is the hypotnus (the diaganal side)
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 !
There are: 70mm = 7cm
There are: 70mm = 7cm
7cm = 0.070000m (m being metres). In case it should have been millimetres! 7cm = 70 mm