Question

volume of cylinder is 15400 cm height is 25 . what is its diameter

Answer 1

$volume \: of \: cylinder = \pi {r}^{2}h \\ 15400 \: {cm}^{3} = \frac{22}{7} \times {r}^{2} \times 25 \\ {r}^{2} = \frac{15400 \times 7}{25 \times 22} \\ {r}^{2} = \frac{700 \times 7}{25} \\ {r}^{2} = 28 \times 7 \\ {r}^{2} = 196 \\ r = 14 \\ diameter = r \times 2 \\ = 2 \times 14 \\ 28 \: cm$

Answer 2

π×r square×h=15400cm
π×r square×25=15400
22/7×r square=15400/25
=616
r square=616/22×7
=196
r=√196
r=14cm
so,
d=2×r
=2×14
=28cm