The Volume Formula of a Sphere

What is the relationship between a hemisphere, a cone, and a cylinder? Using Cavalieri's Principle, the class determines that the sum of the volume of a hemisphere and a cone with the same radius and height equals the volume of a cylinder with equal radius and height. The activity continues to incorporate the volume formula to derive the formula for the surface area of a sphere. 

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CCSS: Designed
Instructional Ideas

  • Research and find visuals of Cavalieri's Principle proof of the volume of a sphere that can be projected to show the class during the discussion
  • It may be beneficial to split the lesson into two days, one day for the volume and one day for the surface area
Classroom Considerations

  • The concept may be difficult to grasp without being able to see it; add visuals to make the lesson more understandable
  • The twelfth lesson in a 14-part series

  • Includes a graphic organizer that is commonly used with vocabulary
  • Provides some images that will be helpful to those struggling to envision what is being discussed

  • None