Total surface area of aright circular cylinder is 1848 cm2. The ratio of its total surface area to the curved surface area is 3 : 1. The volume of the cylinder is:(Take $\pi = \frac{22}{7}$) |
4002 cm2 3696 cm2 4312 cm2 4851 cm2 |
4312 cm2 |
We know that, Total surface area of cylinder = 2πr(r + h) Curved surface area of cylinder = 2πrh and Volume of cylinder = πr2h We have, 2πr(r + h) = 1848 \(\frac{ 2πr(r + h)}{ 2πrh }\) = \(\frac{3}{1}\) = r + h = 3h = 2h = r = h = \(\frac{r}{2}\) Put it in the total surface area formula, = 2 × \(\frac{22}{7}\) × r × (r + \(\frac{r}{2}\)) = 1848 = 2 × \(\frac{22}{7}\) × r × \(\frac{3r}{2}\) = 1848 = r2 = 7 × 7 × 4 = r = 14 = h = \(\frac{14}{2}\) = 7 cm = Volume of cylinder = \(\frac{22}{7}\) × 14 × 14 × 7 = 4312 cm3 |