The radius of a right circular cone is 3.5 cm and slant height is 0.21 m, then what is its lateral surface area? (use π = 22/7)

Correct option is A

Given:
Radius (r) = 3.5 cm
Slant height (l) = 0.21 m = 21 cm
Formula Used:
Lateral surface area (L) = π × r × l
Solution:
=> L = $$\frac {22}{7}$$​× 3.5 × 21
=> L = 11 × 21
=> L = 231 sq. cm