Скачать или смотреть Chapter 13 Exercise 13.7 Q9 | Volume of Cones | NCERT Class 9 Math |

This question focuses on curved surface area and volume of right circular cylinders. The question appears as part of exercise questions from Chapter 13 of NCERT class 9 maths book. Surface areas & Volumes.

CBSE Online Coaching | NCERT Class 9 Math | NCERT Solutions for Class 9 Math | Chapter 13 Surface Areas & Volumes | Exercise 13.7 Question 9 | Volume of Cones

Question 9:
A heap of wheat is in the form of a cone whose diameter is 10.5 m and height is 3 m. Find the volume. The heap is to be covered by canvas to protect it from rain. Find the area of the canvas required.

Approach to solve the question:
1. Compute the volume of conical heap using the formula, Volume of cone = 1/3 * pi * r^2 * h, where r is the radius of the conical heap; h is the height of the conical heap.
2. The slant height of the cone can be calculated using the formula, Square of the slant height of the cone, l^2 = h^2 + r^2, where r is the radius of the conical heap; h is the height of the conical heap.
3. It is clear that Area of the canvas required is equal to the curved surface area of the conical heap.
4. Compute the curved surface area of the conical heap using the formula,CSA of the cone = pi * r * l.

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