Practice30 Create account

Which formula gives the curved surface area of a right circular cone with base radius r and slant height l?

Class 9Surface Area of a ConeMensuration

Aπr(l + r)
B2πrl
Cπrl
Dπ $r^{2}$ l

Step-by-Step Solution

Curved surface area = π

r l

. π

r (l + r)

is the TOTAL surface area (curved part plus the circular base π

r^{2}

).

Answer: C) πrl

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Surface Area of a Cone practice questions

More Class 9 Surface Area of a Cone practice

If the curved surface of a cone is cut along a slant line and laid flat, what shape do…The radius of a cone is 5 cm and its height is 12 cm. What is the slant height?Find the curved surface area of a cone with radius 7 cm and slant height 10 cm. (Use π =…A closed cone has radius 7 cm and slant height 10 cm. What is its total surface area? (π…What is the curved surface area of a cone of radius 14 cm and slant height 20 cm? (π =…