equal triangles

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• Equal incircles theorem — In geometry, the equal incircles theorem derives from a Japanese Sangaku, and pertains to the following construction: a series of rays are drawn from a given point to a given line such that the inscribed circles of the triangles formed by… …   Wikipedia

• Special right triangles — Two types of special right triangles appear commonly in geometry, the angle based and the side based (or Pythagorean) triangles. The former are characterised by integer ratios between the triangle angles, and the latter by integer ratios between… …   Wikipedia

• Area of a disk — Part of a series of articles on the mathematical constant π …   Wikipedia

• Area — This article is about the geometric quantity. For other uses, see Area (disambiguation). The combined area of these three shapes is between 15 and 16 squares. Area is a quantity that expresses the extent of a two dimensional surface or shape in… …   Wikipedia

• Lagrange's identity — In algebra, Lagrange s identity is the identity:iggl( sum {k=1}^n a k^2iggr) iggl(sum {k=1}^n b k^2iggr) iggl(sum {k=1}^n a k b kiggr)^2 = sum {i=1}^{n 1} sum {j=i+1}^n (a i b j a j b i)^2 iggl(= {1 over 2} sum {i=1}^n sum {j=1}^n (a i b j …   Wikipedia

• cuproid — ˈk(y)üˌprȯid noun ( s) Etymology: International Scientific Vocabulary cupr + oid; originally formed as German kuproid crystallog : a solid related to a tetrahedron and having 12 equal triangular faces * * * cuproid Cryst. (ˈkjuːprɔɪd) [f …   Useful english dictionary

• Coincide — Co in*cide , v. i. [imp. & p. p. {Coincided}; p. pr. & vb. n. {Coinciding}.] [L. co + incidere to fall on; in + cadere to fall: cf. F. co[ i]ncider. See {Chance}, n.] 1. To occupy the same place in space, as two equal triangles, when placed one… …   The Collaborative International Dictionary of English

• Coincided — Coincide Co in*cide , v. i. [imp. & p. p. {Coincided}; p. pr. & vb. n. {Coinciding}.] [L. co + incidere to fall on; in + cadere to fall: cf. F. co[ i]ncider. See {Chance}, n.] 1. To occupy the same place in space, as two equal triangles, when… …   The Collaborative International Dictionary of English

• Coinciding — Coincide Co in*cide , v. i. [imp. & p. p. {Coincided}; p. pr. & vb. n. {Coinciding}.] [L. co + incidere to fall on; in + cadere to fall: cf. F. co[ i]ncider. See {Chance}, n.] 1. To occupy the same place in space, as two equal triangles, when… …   The Collaborative International Dictionary of English

• Cuproid — Cu proid (k? proid), n. [Cuprum + oid.] (Crystalloq.) A solid related to a tetrahedron, and contained under twelve equal triangles. [1913 Webster] …   The Collaborative International Dictionary of English

• Hexagram — Hex a*gram, n. [Hexa + gram.] A figure of six lines; specif.: (a) A figure composed of two equal triangles intersecting so that each side of one triangle is parallel to a side of the other, and the six points coincide with those of a hexagon. (b) …   The Collaborative International Dictionary of English