Class 9 Exam  >  Class 9 Notes  >  Lab Manuals for Class 9  >  Viva Voce: The Relationship among the Volumes of a Cone

Viva Voce: The Relationship among the Volumes of a Cone | Lab Manuals for Class 9 PDF Download

Q.1. What is the formula for the volume of a right circular cylinder having radius r and height h?

πr2h


Q.2. “If the radius of cone is halved and height is doubled, then the volume will be doubled”. Does it possible?

No, the volume will become half.


Q.3. What is the volume of a sphere having radius r?

4/3πr3


Q.4. Do you know the formula for the volume of a right circular cone having height h and radius r?

Yes, it is 1/3 πr2h


Q.5. What is the formula for the volume of a hemisphere of radius r?

2/3 πr3


Q.6. Do you know the relationship among the volumes of a right circular cone, a hemisphere and a right circular cylinder of equal radii and equal heights?

Yes, it is 1 : 2 : 3.


Q.7. What is the formula for finding the total surface area of a hemisphere having radius r?

3πr2

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