Here use differentials

If f = f(x) df = f '(x)dx df is the absolute error df/f is the relative eror

Since the length is known exactly

V = V (r)

V = pi r^2 h = 12pi r^2

dV = 24pi r dr

r= 3 dr is the uncertainty in the measurement dr= .0025

Absolute error = dV = 24 pi (3) (.0025)

For Rel Error note V is given by

Then V = 12* 9 *pi

dV/V = 2(.0025)/3