Question

find the curved surface area of the cylinder write the following dimensions RADIUS 21 cm , HEIGHT 5 cm ​

Answer 1

• Curved surface area of cylinder is 660 cm².

Step-by-step explanation :

Given:-

• Radius of cylinder is 21 cm.
• Height of cylinder is 5 cm.

To find:-

• Curved surface area of cylinder.

Solution:-

We know that,

$\boxed{\star \: \sf \bold{Curved\: surface\:area \: of \:cylinder= 2\pi rh}}$

In which,

• r and h are Radius and height of cylinder respectively.

r = 21 cm.

h = 5cm.

Put the values in formula :

$\longrightarrow \sf 2 \times \pi \times 21 \times 5$

$\longrightarrow \sf 2 \times \cfrac{22}{7} \times 21 \times 5$

$\longrightarrow \sf 2 \times 22 \times 3 \times 5$

$\longrightarrow \sf 44 \times 15$

$\longrightarrow \sf 660$

Therefore,

Curved surface area of cylinder is 660 cm².

Answer 2

$\sf\red{\underline{Question:}}$

find the curved surface area of the cylinder with the following dimensions RADIUS 21 cm , HEIGHT 5 cm.

$\sf\red{\underline{Solution:}}$

$\sf Radius~of~cylinder=21 cm</p><p> \\ \\ \sf Height~of~cylinder= 5cm \\ \\ \sf \blue{CSA~of~cylinder= 2πrh } \\ \\ \sf \implies 2π(21)(5) \\ \\ \sf \implies 660cm^2$