Скачать или смотреть NCERT Class 9 Math | Chapter 13 Exercise 13.3 Q8 | Curved Surface Area of Cone | CBSE Online Classes

CBSE Online Coaching | NCERT Class 9 Math | NCERT Solutions for Class 9 Math | Chapter 13 Surface Areas & Volumes | Exercise 13.3 Question 8 | Surface Area of Cones

This question is from Chapter 13 of NCERT class 9 maths book. Surface areas & Volumes. Tests your understanding of the surface area of cones.

Question:
A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of the painting is Rs.12 per m^2, what will be the cost of painting all these cones ? ( Use "π" = 3.14 and take √("1.04" ) = 1.02)

Approach to solve the question
1. Compute the slant height of the cone l, using the Square of slant height formula l^2 = r^2 + h^2.
2. The formula to compute curved surface area of cone is pi * r * l, where r is the radius of the base of the cone and l is the slant height of the cone.
3. Area of each cone to be painted = Curved surface area of the cone . Compute the curved surface area of 50 conical barricades.
3. Cost of painting per m^2 is 12. Compute the cost of Painting 50 Conical Barricades.

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