Portal:Mathematics/Featured picture/2008 03

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{{Portal:Mathematics/Feature picture|img=Triangles (spherical geometry).jpg|more=Spherical geometry|user=Lars H. Rohwedder|desc=Spherical geometry is the geometry of the two-dimensional surface of a sphere. It is an example of a non-Euclidean geometry. Two practical applications of the principles of spherical geometry are navigation and astronomy. On a sphere, the sum of the angles of a triangle is not equal to 180°.|class={{{class}}}}}

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