2 Answers

Natosha · Answer 1 · 2022-10-28T16:03:39+0000

As, we have :

To find surface area, we have a formula :

$\Large \underline{\boxed{\tt{Surface \: Area = 2\pi rh+2 \pi r^(2)}}}$

By filling values :

$\sf : \implies Surface \: Area = 2 \pi (7)(20)+2 \pi (7)^(2)$

$\sf : \implies Surface \: Area = 280 \pi + 2 \pi (7)(7)$

$\sf : \implies Surface \: Area = 280 \pi + 98 \pi$

Now, put value of π = 22/7

$\sf : \implies Surface \: Area = 280* (22)/(7) + \cancel{98} * \frac{22}{\cancel{7}}$

$\sf : \implies Surface \: Area = 40 * 22 + 14 * 22$

$\sf : \implies Surface \: Area = 880 + 308$

$\sf : \implies Surface \: Area = 1188$

$\Large \underline{\boxed{\tt{Surface \: Area = 1188 \: inches^(2) }}}$

Hence, Surface area of given cylinder is 1188 inches².

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