VRMS = 1/N Times Square root of [ sum(Vn2) ]
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For an object moving at a variable velocity you:calculate the square of the velocityfind its mean valuecalculate its square root.If the velocity is constant then the RMS velocity has the same value.
un = u0*rn for n = 1,2,3, ... where r is the constant multiple.
I believe you mean perimeter. Perimeter(square) = 4*length of one side.
Assuming var is variance, simply square the standard deviation and the result is the variance.
If you mean a circle then its square footage formula is: pi*radius2