Cylinder and its circumference

If the height of a cylinder is 4 times its circumference c, what is the volume of the cylinder in terms of its circumference, c?

Result

V = (Correct answer is: c^3 / pi) Wrong answer

Solution:

h=4c c=2 πr  S1=πr2=π(c/(2 π))2 S1=c2/(4 π)  V=S1 h=(c2/(4 π))⋅ (4c)=c2⋅ 4 c4 π  V=c3π  V=c3/π

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