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# Spheres

## Volume and surface area of 3D circles.

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Spheres

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### Vocabulary Language: English Spanish

diameter

A chord that passes through the center of the circle. The length of a diameter is two times the length of a radius.

The radius of a circle is the distance from the center of the circle to the edge of the circle.

Sphere

A sphere is a round, three-dimensional solid. All points on the surface of a sphere are equidistant from the center of the sphere.

Volume

Volume is the amount of space inside the bounds of a three-dimensional object.

Cavalieri's Principle

States that if two solids have the same height and the same cross-sectional area at every level, then they will have the same volume.

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