- 曾几何时 céngjǐhéshí not long agoit was only a short while ago; just a while before; used to describe a situation that was recently true, often with a sense of nostalgia or surprise
- 几何学 jǐhéxué geometrythe branch of mathematics that studies the shape, size, and position of figures and the properties of space; also called [[几何|幾何|ji3 he2]]
- 几何级数 jǐhéjíshù geometric seriesa series of numbers where each term after the first is found by multiplying the previous one by a fixed number; also called [[等比级数|等比級數|deng3 bi3 ji2 shu4]]
- 解析几何 jiěxījǐhé analytic geometryThe branch of mathematics that uses algebraic methods and coordinate systems to solve geometric problems; also called [[坐标几何|座標幾何|zuo4 biao1 ji3 he2]]
- 几何体 jǐhétǐ geometric forma three-dimensional shape or solid formed by flat or curved surfaces; also called a [[立体|立體|li4 ti3]]
- 平面几何 píngmiànjǐhé plane geometrythe branch of geometry that deals with the properties of flat shapes and figures; planimetry
- 球面几何 qiúmiànjǐhé spherical geometry
- 几何平均值 jǐhépíngjūnzhí geometric meanthe nth root of the product of n numbers, used in statistics and mathematics
- 几何平均数 jǐhépíngjūnshù geometric meanThe average of a set of n numbers defined as the nth root of their product
- 几何拓扑 jǐhétuòpū geometric topology(math) geometric topology
- 几何拓扑学 jǐhétuòpūxué geometric topologythe branch of mathematics that deals with geometric properties and spatial relations that are unaffected by continuous change of shape or size
- 几何级数增长 jǐhéjíshùzēngzhǎng exponential increaseexponential increase; growth at a geometric rate
- 几何量 jǐhéliàng geometric quantity
- 分形几何 fēnxíngjǐhé fractal geometrythe branch of mathematics that studies fractals; fractal geometry
- 分形几何学 fēnxíngjǐhéxué fractal geometrythe branch of mathematics that studies fractals
- 双曲几何 shuāngqūjǐhé hyperbolic geometry
- 坐标几何 zuòbiāojǐhé coordinate geometrythe study of geometry using a coordinate system and the principles of algebra and analysis; also known as analytic geometry
- 射影几何 shèyǐngjǐhé projective geometrythe branch of mathematics concerned with the properties of geometric figures that are invariant under projection
- 射影几何学 shèyǐngjǐhéxué projective geometrythe branch of mathematics that studies the properties of geometric figures that are invariant under projection
- 微分几何 wēifēnjǐhé differential geometry
- 微分几何学 wēifēnjǐhéxué differential geometryThe branch of mathematics that uses techniques from calculus to study geometry
- 投影几何 tóuyǐngjǐhé projective geometryThe branch of geometry dealing with properties of figures that are invariant under projection
- 投影几何学 tóuyǐngjǐhéxué projective geometrythe branch of geometry dealing with properties that remain unchanged under projection
- 欧几里得几何 ōujǐlǐdéjǐhé Euclidean geometrythe mathematical study of flat space and shapes based on the axioms of the ancient Greek mathematician Euclid
- 欧几里得几何学 ōujǐlǐdéjǐhéxué Euclidean geometrythe branch of mathematics and mathematical system attributed to the ancient Greek mathematician Euclid
- 欧式几何 ōushìjǐhé Euclidean geometrythe study of geometry based on the definitions and axioms of Euclid
- 欧式几何学 ōushìjǐhéxué Euclidean geometrythe branch of mathematics based on the work of the Greek mathematician Euclid
- 欧氏几何 ōushìjǐhé Euclidean geometrysystem of geometry based on the work of the Greek mathematician Euclid
- 欧氏几何学 ōushìjǐhéxué Euclidean geometryA branch of mathematics based on the definitions and axioms of the ancient Greek mathematician [[欧几里得|歐幾里得|ou1 ji3 li3 de2]].
- 球面几何学 qiúmiànjǐhéxué spherical geometryspherical geometry; the study of geometric figures on the surface of a sphere
- 画法几何 huàfǎjǐhé descriptive geometrythree-dimensional geometry using projections and elevations
- 立体几何 lìtǐjǐhé solid geometryThe branch of geometry that deals with the properties and measurements of three-dimensional shapes; study of points, lines, planes, and angles in space.
- 罗式几何 luóshìjǐhé hyperbolic geometryhyperbolic geometry; also known as Lobachevskian geometry
- 罗氏几何 luóshìjǐhé hyperbolic geometryhyperbolic geometry; Lobachevskian geometry
- 解析几何学 jiěxījǐhéxué analytic geometryanalytic geometry; coordinate geometry
- 非欧几何 fēi'ōujǐhé non-Euclidean geometry
- 非欧几何学 fēi'ōujǐhéxué non-Euclidean geometry
- 黎曼几何 límànjǐhé Riemannian geometrya branch of differential geometry that studies smooth manifolds with a Riemannian metric; named after the mathematician Bernhard Riemann
- 代数几何 dàishùjǐhé algebraic geometrythe branch of mathematics that studies the solutions of sets of algebraic equations using techniques from geometry
- 黎曼几何学 límànjǐhéxué Riemannian geometrythe branch of mathematics that studies curved spaces developed by Bernhard Riemann
- 代数几何学 dàishùjǐhéxué algebraic geometryThe branch of mathematics that combines abstract algebra with geometry to study the sets defined by algebraic equations.
- 内在几何 nèizàijǐhé intrinsic geometry
- 内在几何学 nèizàijǐhéxué intrinsic geometrythe study of the geometric properties of a surface or space that do not depend on how it is positioned within a higher-dimensional space
- 几何光学 jǐhéguāngxué geometric opticsthe branch of optics that describes light propagation in terms of rays
- 几何原本 jǐhéyuánběn ElementsEuclid's "Elements" (geometry treatise)
- 几何图形 jǐhétúxíng geometric figureA shape or pattern made of points, lines, surfaces, and solids; also referred to as [[空间图形|空間圖形|kong1 jian1 tu2 xing2]]
- 几何平均 jǐhépíngjūn geometric meanthe nth root of the product of n numbers, often used to calculate average growth rates