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In [[triangle geometry]], the '''incentre''' of a triangle is the centre of the '''incircle''', a

*the area of a [[square (geometry)|square]] measuring 1 [[kilometre]] on each side

...al calculus]]. Combinatorics also studies [[code]]s, [[design]]s, [[finite geometry|finite geometries]] and [[Latin square]]s. Other branches are [[algebraic c

...s are kept constant. Partial derivatives are widely used in [[differential geometry]], [[vector calculus]], and [[physics]].

...y — that for any two of its points entirely contains the [[line (Euclidean geometry)|straight line]] joining them. ...l affine subspaces. In an axiomatic approach, basic concepts of elementary geometry, such as "point", "line" and "plane", are undefined primitives.

In [[geometry]] a '''divisor''' on an [[algebraic variety]] is a formal sum (with integer

..., but he and Reimann invented somewhat different variants of non-Euclidean geometry approximately simultaneously. [[User:Sandy Harris|Sandy Harris]] ([[User ta

In [[algebraic geometry]] the '''Riemann-Hurwitz formula''', named after [[Bernhard Riemann]] and [

...y — that for any two of its points entirely contains the [[line (Euclidean geometry)|straight line]] joining them. ...l affine subspaces. In an axiomatic approach, basic concepts of elementary geometry, such as "point", "line" and "plane", are undefined primitives.

In [[algebraic geometry]] the '''Riemann-Roch theorem''' states that if <math>C</math> is a smooth good descriptions of the geometry of the linear system.

** [[Algebraic curve]] of [[genus (geometry)|genus]] one versus [[elliptic curve]].

...l mass'' of fissile material. Furthermore, the criticality depends on the geometry of the material. When a critical mass of fissile material is sufficiently

In [[Euclidian geometry]], the sum of the three interior angles of any triangle is 180 degrees. Th ...ing definitions on a circle, and analytic definitions which do not rely on geometry.

...a German mathematician who made important contributions to [[differential geometry]], the [[complex analysis|theory of functions]], and [[number theory]]. ...d that it could have any finite dimension. Riemann's work on differential geometry was carried on by the Italian school of mathematicians, such as [[Eugenio

In [[geometry]], '''barycentric coordinates''' form a homogeneous coordinate system based

...s. There is an English translation by D. E. Smith and M. L. Lantham (''The Geometry of René Descartes'', Dover, 1954).

{{Image|Lacey D. Caskey, The Geometry of Greek Vases, p.37.jpg|right|250px|illustrating geometric proportions in <blockquote>Geometry has two great treasures; one is the Theorem of Pythagoras; the other, the d

{{r|Algebraic geometry}}

...including [[number theory]], [[statistics]], [[analysis]], [[differential geometry]], [[geodesy]], [[electromagnetism]], [[astronomy]], and [[optics]]. Gauss

...ld gradients are generated by passing current through coils of appropriate geometry.