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Course: Class 10 (Old) > Unit 12

Lesson 3: Frustum of a cone
Math
Class 10 (Old)
Surface areas and volumes
Frustum of a cone
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Volume of frustum

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Problem

A table lamp is in the form of a frustum. The radii of its ends are 4cm and 12cm.
The height of the lamp is 15cm.
What is the volume of the lamp?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
πcm3