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Mathematics

Grade9

Easy

Question

Find the surface area of the cylinder with a radius of 1 in. and a height of 2 in.

12.56 in²
6.28 in²
39.44 in²
18.84 in²

hint Hint:

The total surface area of the cylinder is $2 pi r left parenthesis r plus h right parenthesis$ , where r is the radius of the cylinder and h is the height of the cylinder.

The correct answer is: 18.84 in²

The total surface area of the cylinder is $2 pi r left parenthesis r plus h right parenthesis$ , where r is the radius of the cylinder and h is the height of the cylinder.
In this question we are given the height = $2 space i n.$ and radius = $1 space i n.$
Step1: Calculating the total surface area of cylinder by putting the values of r and h in the formula of total surface area of cylinder.
$2 pi r left parenthesis r plus h right parenthesis$
=> $2 cross times pi cross times 1 cross times left parenthesis 1 plus 2 right parenthesis$
=> $18.84 space i n squared$
So, the total surface area of the cylinder is $18.84 space i n squared$ .

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