Question

(ix). The base radius of cylinder is 7 cm and its height is 3 cm.
Then what is CSA?
(a) 132 cm? (b) 220 cm2 (c) 1232 cm (d) 440 cm
.​

Answer 1

Answer:

132cm²

Step-by-step explanation:

Given, r = 7 cm

h = 3 cm

∴ Curved surface area of cylinder

= 2πrh = 2 × 22 7 × 7 × 3 = 132 cm²

Answer 2

✯ Given:

We are given a cylinder whose radius and height is 7 cm and 3 cm respectively.

✯ To find:

We need to find the curved surface area of cylinder.

✯ Formula applied:

To find CSA of cylinder, we use the below formula:

$\star{\underline{\boxed{\bf{CSA = 2 \pi rh}}}}$

Here,

• CSA = Curved surface area of cylinder
• Let us assume the value of pi as 22/7.
• r = Radius of the cylinder
• h = Height of the cylinder

✯ Solution:

On applying the formula directly, we get:

$\sf{\longrightarrow CSA = 2 \pi rh}$

$\sf{\longrightarrow CSA = 2 \times \dfrac{22}{7} \times 7 \times 3}$

$\sf{\longrightarrow CSA = 2 \times 22 \times 3}$

$\sf{\longrightarrow CSA = 132\:cm^2}$

✯ Conclusion:

The curved surface area of cylinder is 132 cm².

✯ More information about cylinder:

$\tt{\longrightarrow CSA = 2 \pi rh}$

$\tt{\longrightarrow TSA = 2 \pi r(h+r)}$

$\tt{\longrightarrow Volume = \pi r^2h}$