The curved surface area of right circular cone of radius 21cm is 1518$$cm^2$$​. What is the slant height of the cone?(Use $$\pi =\frac{22}{7}$$​)

Correct option is C

Given:

Curved surface area of cone = 1518$$cm^{2}$$​​

Radius of cone =21cm

Formula Used:

Lateral surface area of cone =$$\pi r l$$​​

Solution:

Curved surface area of cone = $$\pi r l$$​​

​$$\pi r l =1518$$​​

​$$\frac{22}{7} (21) l = 1518cm^{2}$$​​

​$$l = 1518 \times \frac{7}{22} \times \frac{1}{21} = 23cm$$​