Question
The total surface area of a right circular cylinder with radius of the base 7 cm and height 20 cm, is :
Answer: Option D
Radius and height of a right circular cylinder is 7 cm and 20 cm respectively
Total surface area of right circular cylinder :
$$\eqalign{
& = 2\pi rh + 2\pi r^2 \cr
& = 2\pi r\left( {h + r} \right) \cr
& = 2 \times \frac{{22}}{7} \times 7\left( {20 + 7} \right) \cr
& = 2 \times 22 \times 27 \cr
& = 1188\,sq.\,cm \cr} $$
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Radius and height of a right circular cylinder is 7 cm and 20 cm respectively
Total surface area of right circular cylinder :
$$\eqalign{
& = 2\pi rh + 2\pi r^2 \cr
& = 2\pi r\left( {h + r} \right) \cr
& = 2 \times \frac{{22}}{7} \times 7\left( {20 + 7} \right) \cr
& = 2 \times 22 \times 27 \cr
& = 1188\,sq.\,cm \cr} $$
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