Question

Find the curved surface area of a right circular cylinder of height 21cm and base radius 5cm

Answer 1

Step-by-step explanation:

height of cylinder is 27cm

base radius is 5cm

curved surface area =?

$2 \pi \: rh \\ 2 \times \frac{22}{7} \times 5 \times 21 \\ = 660$

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Answer 2

$\bf{\underline{\underline \blue{Solution:-}}}$

$\sf\underline{\red{\:\:\: AnswEr:-\:\:\:}}$

• The curved surface area of the cylinder = 660 Cm²

$\sf\underline{\red{\:\:\: Given:-\:\:\:}}$

• The height of the cylinder is 21 Cm.
• The radius of the cylinder is 5 Cm.

$\sf\underline{\red{\:\:\: Need\:To\: Find:-\:\:\:}}$

• The curved surface area of the cylinder = ?

$\bf{\underline{\underline \blue{Explanation:-}}}$

$\sf\underline{\red{\:\:\: Formula\:Used\: Here:-\:\:\:}}$

$\bigstar \: \boxed{ \sf \: C.S.A \:of\:the\: cylinder = 2\pi rh}$

$\sf\underline{\green{\:\:\: Now,Putting\:the\: values:-\:\:\:}}$

$\dashrightarrow \sf {Curved \: surface\:area = 2 \times \frac{22}{7} \times 5 \times 21}$

$\dashrightarrow \sf {Curved \: surface\:area = 2 \times 22 \times \times 5 \times 3}$

$\dashrightarrow \sf {Curved \: surface\:area = 22 \times 30}$

$\dashrightarrow \sf {Curved \: surface\:area = 660\:Cm^2}$

$\sf\underline{\red{\:\:\: ThereFore:-\:\:\:}}$

• The curved surface area of the cylinder is 660 Cm².

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