- A11%
- B21%
- C20%
- D10%
Step-by-Step Solution
New CSA = ππ, an increase of 21%. (20% simply adds the two percentages.)
Answer: B) 21%
The radius and the slant height of a cone are each increased by 10%. By what percent does its curved surface area increase?
Class 9Surface Area of a ConeMensuration
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
A cone has height 15 cm and slant height 17 cm. Find its total surface area in terms of π.A conical tent has base radius 21 m and height 20 m. Canvas costs ₹25 per m². What does…A conical tent of height 8 m and base radius 6 m is made from canvas 3 m wide. What…Fifty hollow traffic cones, each with base diameter 40 cm and height 1 m, are painted on…Which formula gives the curved surface area of a right circular cone with base radius r…