Euclidean Geometry#Related Articles

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	A list of Citizendium articles, and planned articles, about Euclidean geometry.

See also changes related to Euclidean geometry, or pages that link to Euclidean geometry or to this page or whose text contains "Euclidean geometry".

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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 ${\displaystyle i^2=-1}$. ^[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 (Euclidean 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]: Add brief definition or description
• Square [r]: Add brief definition or description
• Surface (geometry) [r]: Add brief definition or description

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