Question

Calculate the total surface area of a cylinder whose radius is 7cm and height is 21cm.

1212
1227
1232
1242

Answer 1

The answer is 1232cm^2

Explanation:

Formula for total surface area of a cylinder is=2
`\pi`r²+2
`\pi`rh

radius=7 cm

height=21 cm

∴TSA= 2 x 3.14 x 7² + 2 x 3.14 x 7 x 21

TSA= 2 x 3.14 x 49 + 2 x 3.14 x 7 x 21

TSA=1232cm².

You can also use 22/7 for pile/
`\pi` instead of 3.14.

It's your choice.

Thanks.

Answer 2

C. 1232

Explanation:

A=2πrh+2πr2=2·π·7·21+2·π·72=1232.