Question

The capacity of a closed cylinder vessel of height 84 cm is 26.4 liters. find curved surface area

Answer 1

height=84cm
volume=26.4 l=26400 cubic centimetre
$\pi {r}^{2} h = 26400 \\ \frac{22}{7} \times {r}^{2} \times 84 = 26400 \\ {r}^{2} \times 84 = \frac{7}{22} \times 26400 \\ {r}^{2} \times 84 = 8400 \\ {r}^{2} = 100 \\ r = 10$
csa=2πrh
$2 \times \frac{22}{7} \times 10 \times 84 = 5280 {cm}^{2}$
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