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# Spheres

## Volume and surface area of 3D circles.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Spheres

This concept teaches students how to calculate the volume and surface area of a sphere.
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• PLIX

## Surface Area and Volume of a Sports Ball

Spheres Interactive
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• Video

## Spheres Principles

This video gives more detail about the mathematical principles presented in Spheres.
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## Spheres Examples

This video shows how to work step-by-step through one or more of the examples in Spheres.
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• Critical Thinking

## Spheres Discussion Questions

A list of student-submitted discussion questions for Spheres.
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• Real World Application

## Where We Live!

Discover the geometry of the shape of the Earth.
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• Study Guide