If the triangle ABC in the Question 7 above is revolved about the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in Questions 7 and 8.

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TextVolume of ConeNCERT Textbook

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ASSERTION (A): A cylinder and a right circular cone have the same base and same height. If the volume of the cone is 25 cubic units, then the volume of the cylinder is 75 cubic units. REASON (R): A cylinder and a right circular cone have the same base and same height. The volume of the cylinder is three times the volume of the cone

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The height of a conical vessel is 3.5 cm. If its capacity is 3.3 litres of milk. Find the diameter of its base.

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The radius and slant height of a cone are in the ratio 4 : 7. If its curved surface area is 792 cm², find its radius. (Use π = 22/7).

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Once upon a time in Ghaziabad was a corncob seller. During the lockdown period in the year 2020, his business was almost lost. So, he started selling corn grains online through Amazon and Flipkart. Just to understand how many grains he will have from one corncob, he started counting them. Being a student of mathematics, let's calculate it mathematically. Let's assume that one corncob (see Fig.), shaped somewhat like a cone, has the radius of its broadest end as 2.1 cm and length as 20 cm.

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