Question

Question 2

The radius of a cylinder is 5 cm and the height is 7 cm.
Find the Surface Area of the Cylinder. (hint: use the lateral area from the previous question.)
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Answer 1

The surface area of the cylinder is
`\mathbf{70\pi\;\textbf{cm}^2}`

Explanation:

The surface area of a cylinder is express

`S=2\pi rh`

where
`r` is the radius of the cylinder and
`h` its height

Therefore, if the radius of the cylinder is

`r=5\;\text{cm}`

and its height

`h=7\;\text{cm}`

the surface area should be

`S=2\pi r h\\S=2\pi (5\;\text{cm})(7\;\text{cm}) \;\;\;\;\;\Rightarrow\;\;\;\;\; \mathbf{S=70\pi\;\textbf{cm}^2}`