Question

an open drum is surmounted on a hemisphere whose radius is 7/2 cm and height of cylinder is 2 times of its radius.find the T.S.A of solid​

Answer 1

Answer:

497cm^2

Step-by-step explanation:

$tsa \: of \: solid = csa(cylinder) + csa(hemisphere) \\ \: \: \: \: \: = 2\pi \times r \times h + 2\pi {r}^{3} \\ \: \: \: \: \: = 2\pi \times \frac{7}{2} \times 7 + 2\pi \times { \frac{7}{2} }^{3} \\ \: \: \: \: = 2 \times \frac{22}{7} \times \frac{7}{2} \times 7 + 2 \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times \frac{7}{2} \\ \: \: \: \: = 22 \times 7 + 49 \times 7 \\ \: \: \: \: = 497$