If you mean that 15mm is the diameter, then the circumference will be 47.1mm
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15mm what? Diameter or radius? Formula for finding Circumference is Pi X Diameter. If 15mm is the Diameter, multiply 15mm by 3,1614 = 47.124mm. If 15mm is Radius, then multiply Radius by 2 to get Diameter and then multiply by 3.1416 = 15 X 2 = 30 X 3.1416 = 94.248mm.
A circumference is 4
The radius is half the diameter 15mm because the raduis is half the diameter so 30mm divided by 2mm it would be 15mm
v = area of base * h = pi*r^2 * h so v = pi*15mm^2 * 300mm which can be done on a calculator.
The given dimensions are incorrect for it to be a square because a square has 4 equal sides and its area in square units is: a side times a side.