If the radius of a cone is 10 cm and its height is 30 cm, find the volume of the cone.

A. 500Ο€ cmΒ³
B. 1000Ο€ cmΒ³
C. 2000Ο€ cmΒ³
D. 3000Ο€ cmΒ³
Correct Answer: B. 1000Ο€ cmΒ³

Correct answer: 1000Ο€ cmΒ³. Volume = (1/3)Ο€rΒ²h = (1/3)Ο€(10)Β²(30) = 1000Ο€ cmΒ³.

Background: The volume of a cone is one-third of the cylinder with the same base and height.

  • 500Ο€ cmΒ³: 500Ο€ is too small.
  • 2000Ο€ cmΒ³: 2000Ο€ is too large.
  • 3000Ο€ cmΒ³: 3000Ο€ is the volume of a cylinder with the same base and height.

Did you know? A cylinder with these measurements has volume Ο€rΒ²h = 3000Ο€.

Memory trick: Cone = 1/3 of cylinder.

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