Question

diameter of base of cone is 1.4 cm and its slant height is 10 cm find its curved surface area​

Answer 1

Answer:

The curved surface area of cone is $21.98 cm^{2}$

Step-by-step explanation:

Curved surface area of a right circular cone of base radius, 'r' and slant height, (l) is $\pi rl$.

As per the given information in question.

Given,

Diameter (d) = 1.4 cm

Slant height (l) = 10 cm

Radius (r) = $\frac{Diameter}{2}$

Radius (r) = $\frac{1.4}{2}$ cm

Radius (r) = 0.7 cm

We have to find the curved surface area,

curved surface area = $\pi rl$

The value of $\pi$ is $\frac{22}{7}$.

$=\frac{22}{7}\times0.7\times10\\=3.14\times0.7\times10 \\=2.198\times10\\=21.98 cm^{2}$

∴ The curved surface area of cone is $21.98 cm^{2}$