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Categories: Differential geometry | Elementary geometry Elementary geometry consists of topics from geometry frequently taught at the primary or secondary school level | Homogeneous spaces | Surfaces Categories: Differential geometry | Algebraic geometry | Manifolds | Topological graph theory | Geometric shapes | Topology In mathematics, topology is a branch of geometry concerned with the study of topological spaces. The term topology is also used for a set of open sets used to define topological spaces. See the topology glossary for common terms and their definition | Greek loanwords Categories: English words and phrases of foreign origin | Greek words and phrases

<<Table of Contents A sphere is a 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 same distance r from the center point. This distance r is known as the radius of the sphere. The

 

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