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www.mathsisfun.com/geometry/sphere.html

Of all the shapes, a sphere has the smallest surface area for a volume. Or put another way it can contain the greatest volume for a fixed surface area. Example: if you blow up a balloon it naturally forms a sphere because it is trying to hold as much air as possible with as small a surface as possible. Press the Play button to see.

math.wikia.com/wiki/Sphere

A sphere (from Greek σφαίρα — sphaira, "globe, ball," ) is perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the...

www.britannica.com/science/sphere

Sphere: Sphere, In geometry, the set of all points in three-dimensional space lying the same distance (the radius) from a given point (the centre), or the result of rotating a circle about one of its diameters. The components and properties of a sphere are analogous to those of a circle. A diameter is any

en.wikipedia.org/wiki/Sphere

While outside mathematics the terms "sphere" and "ball" are sometimes used interchangeably, in mathematics the above distinction is made between a sphere, which is a two-dimensional closed surface, embedded in a three-dimensional Euclidean space, and a ball, which is a three-dimensional shape that includes the sphere and everything inside the ...

www.splashmath.com/math-vocabulary/geometry/sphere

Definition of Sphere explained with real life illustrated examples. Also learn the facts to easily understand math glossary with fun math worksheet online at Splash Math. Splash Math is an award winning math program used by more than 30 Million kids for fun math practice.

www.youtube.com/watch?v=9RsBnMwV7mw

Students also learn that the formula for the volume of a sphere is 4/3 times pi times radius cubed, and the formula for the volume of a cone is 1/3 times pi times radius squared times height. Category

study.com/academy/lesson/what-is-a-hemisphere-in-math...

In math, a hemisphere is defined as a three-dimensional shape that's half of a sphere with one flat, circular side. A sphere , on the other hand, is a nearly perfectly round three-dimensional shape.

math.rice.edu/~pcmi/sphere

The Geometry of the Sphere. John C. Polking Rice University The material on these pages was the text for part of the Advanced Mathematics course in the High School Teachers Program at the IAS/Park City Mathematics Institute at the Institute for Advanced Study during July of 1996.. Teachers are requested to make their own contributions to this page.

www.mathsisfun.com/definitions/sphere.html

Math explained in easy language, plus puzzles, games, quizzes, videos and worksheets. For K-12 kids, teachers and parents.

study.com/academy/lesson/sphere-definition-formulas-quiz.html

A sphere is a perfectly round three-dimensional object. This lesson will give a mathematical definition of a sphere, discuss the formulas associated with spheres and finish with a quiz.