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Viva Voce: A Cone from a Sector of a Circle | Lab Manuals for Class 9 PDF Download

Q.1. How will you define a cone?

A cone is a three dimensional geometrical shape that has one circular base and one vertex.


Q.2. Do you know about any formula for finding the area of base of a cone?

Yes, we know that area of base of a cone can be calculated with help of the formula for finding the area of a circle, i.e. πr2.


Q.3. What is the sector of a circle?

The sector of a circle is the portion which is enclosed by two radii and an arc.


Q.4. What is the formula for finding the curved surface area of a cone of radius r and slant height l?

Curved surface area of a cone = πrl


Q.5. What is the slant height of a cone having radius r and height h?

Slant height, l = √(h2 + r2)

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