Question

4. Curved surface area of a cylinder whose radius is 7 cm and height 10 cm is​

Answer 1

r = 7 cm

h = 10 cm

CSA = 2πrh

= 2 × 3.14 × 7 × 10

= 439.6 sqcm

Answer 2

Before, finding the answer. Let's find out we can find the answer.

• In this question, we are asked to find the Curved Surface Area of a Cylinder.
• So, to find the Curved Surface Area, we must use the formula of :

$\boxed{ \tt Curved \: Surface \: Area = 2 \pi rh }$

Here,

${ \tt \pi = \dfrac{22}{7} }$

_____________________

Given :

• Radius = 7 cm
• Height = 10 cm

To find :

• Curved Surface Area

Solution :

Curved Surface Area = 2πrh

                                   ${ \tt = 2 \times \dfrac{22}{7} \times 7 \times 10 }$

                                   ${ \tt = 2 \times \dfrac{22}{7} \times 70 }$

                                   ${ \tt = \dfrac{22}{7} \times 140 }$

                                   ${ \tt = \dfrac{22 \times 140}{7} }$

                                   ${ \tt = \dfrac{3080}{7} }$

                                   ${ \tt = 440}$

Therefore, the Curved Surface Area of Cylinder is 440 cm².