Volume of a cylinder = πr2\pi r^2πr2h
385 = 227\frac{22}{7}722 x r2r^2r2 x 10
385 x 7 = 22 x r2r^2r2 x 10
r2r^2r2 = 385×722×10\frac{385 \times 7}{22 \times 10}22×10385×7
= 12.25
r = 12.25\sqrt{12.25}12.25
= 3.5m
Hence, diameter of tank = 2r
= 2 x 3.5 = 7m
