Question

the curved surface area of a cylinder is 440 square find its volume if the height of it is 21 CM​

Answer 1

Answer:

CSA of cylinder = 440 cm2

$2\pi \: rh \: = 440 \\ h \: = 21 \\ 2\pi \: r = 440 \div 21 \\ \\ \pi \: r = 10.47 \\ volume \: of \: cylinder \: = \pi \: r {}^{2} h \: \\ \pi \: r \: (rh) \\ 10.47(10.47 \div \pi \: \times 21) \\ = 10.47(69.93) \\ = 732.16$