Question

the curved surface of a cylinder pillar is 264m2 and its volume is 924m3 the diameter of pillar is

Answer 1

$\pi {r}^{2} h = 924 \: \\ h = \frac{924}{\pi {r}^{2} } \\ again \\ 2\pi \: rh = 264 \\ h = \frac{132}{\pi \: r} \\ now \: h = h \\ \frac{924}{\pi \: {r}^{2} } = \frac{132}{\pi \: r} \\ hence \: r = 7$
Hence diameter is 7*2=14