# Euclidean geometry/Related Articles

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*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 .^{[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]:
*Add brief definition or description* - Square [r]:
*Add brief definition or description* - Surface (geometry) [r]:
*Add brief definition or description*