Question

The radius of a cone is 7 cm and height is 24 cm. What is its curred surface area?

Options

• 550 cm²

• 110 cm²

• 440 cm²

• 330 cm²

Answer 1

550 cm²

Explanation:

Slant height `l = sqrt(r^2 + h^2)` 

= `sqrt(7^2 + 24^2)` 

= `sqrt(49 + 576)`

= `sqrt(625)`

= 25

Curved surface area = πrl 

= π × 7 × 25

= 175π

Using `π = 22/7` gives `175 × (22/7)` = 550 cm² (or 175 × 3.14 ≈ 549.5 ≈ 550).