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# Euclidean geometry/Related Articles  Main Article Discussion Related Articles  [?] Bibliography  [?] External Links  [?] Citable Version  [?] A list of Citizendium articles, and planned articles, about Euclidean geometry.

## Bot-suggested topics

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• Affine space [r]: Collection of points, none of which is special; an n-dimensional vector belongs to any pair of points. [e]
• Albert Einstein [r]: 20th-century physicist who formulated the theories of relativity. [e]
• Christiaan Huygens [r]: (14 April 1629 - 8 June 1695) an internationally renowned Dutch mathematician, physicist and astronomer. [e]
• Complex number [r]: Numbers of the form a+bi, where a and b are real numbers and i denotes a number satisfying . [e]
• Congruence (disambiguation) [r]: Add brief definition or description
• Congruent triangles [r]: In Euclidean geometry, triangles which can be superposed by a rigid motion. [e]
• Euclid's Elements [r]: Mathematical and geometric treatise consisting of 13 books written by the Greek mathematician Euclid in Alexandria circa 300 BC. [e]
• Euclidean plane [r]: The plane known from high-school planar geometry. [e]
• Euclid [r]: (ca. 325 BC - ca. 265 BC) Alexandrian mathematician and known as the father of geometry. [e]
• Geometry [r]: The mathematics of spacial concepts. [e]
• Line (geometry) [r]: (or straight line) In elementary geometry, a maximal infinite curve providing the shortest connection between any two of its points. [e]
• Mathematics [r]: The study of quantities, structures, their relations, and changes thereof. [e]
• Parallel (geometry) [r]: (of lines or planes) In elementary geometry: having no point in common. [e]
• Perpendicular (geometry) [r]: Add brief definition or description
• Pi (mathematical constant) [r]: Greek letter π and mathematical constant that is approximately equal to 3.14159. [e]
• Plane (geometry) [r]: In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points. [e]
• Point (geometry) [r]: An object that has a position but no length, breadth or depth. [e]
• Polygon [r]: Two-dimensional geometric closed figure bounded by a continuous set of line segments. [e]
• Pythagorean theorem [r]: In a right triangle, the squared length of the side opposite the right angle is equal to the sum of the squared lengths of the two other sides. [e]
• Rectilinear angle (geometry) [r]: The 'steepness' between two straight lines. [e]
• Right angle (geometry) [r]: An angle of 90 degrees, corresponding to a quarter turn (that is, a quarter of a full circle), and twice that angle amounts to a half turn, or 180°. [e]
• Rigid motion [r]: A transformation which preserves the geometrical properties of the Euclidean spacea distance-preserving mapping or isometry. [e]
• Sine [r]: In a right triangle, the ratio of the length of the side opposite an acute angle (less than 90 degrees) and the length of the hypotenuse. [e]
• Solid (geometry) [r]: Branch of mathematics that deals with three-dimensional figures and surfaces. [e]
• Square [r]: Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Square (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
• Surface (geometry) [r]: The (two-dimensional) face of an object in space, or its mathematical abstraction. [e]