# Sphere

A sphere is the region of space that is inside a spherical surface.

### Center

The **center** is the interior point that is equidistant to all points on the surface of the sphere.

### Radius

The **radius** is the distance from the center to any point on the surface of the sphere.

### Diameter

The **diameter** is the distance from one point through the center to another point.

### Surface Area of a Sphere

### Volume of a Sphere

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