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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

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