en.wikipedia.org/wiki/Sphere

A **sphere** is a perfectly round geometrical object in three-dimensional space that
is the surface of a completely round ball Like ...

www.khanacademy.org/math/basic-geo/basic-geo-volume-sa/volume-cones/v/volume-of-a-sphere

The formula for the **volume of a sphere** is V = 4/3 πr³. See the formula used in an
example where we are given the diameter of the sphere.

www.mathopenref.com/spherevolume.html

Animated demonstration of the **sphere volume** calculation.

www.varsitytutors.com/hotmath/hotmath_help/topics/volume-of-a-sphere

A **sphere** is a set of points in space that are a given distance r from the center.
The **volume** of a 3 -dimensional solid is the amount of space it occupies. **Volume**
is ...

brilliant.org/wiki/volume-sphere

A **sphere** is a perfectly round geometrical 3-dimensional object. It can be
characterized as the set of all points located distance ...

www.calculateme.com/cVolume/VolumeOfSphere.htm

This calculator will calculate the **volume of a sphere** given its radius.

www.wikihow.com/Calculate-the-Volume-of-a-Sphere

How to Calculate the **Volume of a Sphere**. A sphere is a perfectly round
geometrical object that is three dimensional, with every point on its surface
equidistant ...

learnzillion.com/lesson_plans/6430-find-the-volume-of-a-sphere

In this lesson you will learn to find the **volume of a sphere** by comparing it to the
volume of a cylinder.