12) mathematics. The Columbia Encyclopedia, Sixth Edition. 2001
...mathematics, deductive study of numbers, geometry, and various abstract constructs, or structures; the latter often "abstract" the features common to several models...

13) pyramid, in geometry. The Columbia Encyclopedia, Sixth Edition. 2001
...pyramid, in geometry, in geometry, solid figure bounded by a polygon (the base, or directrix) and the surface generated by a moving line (the generator) passing through...

14) quadrant, in analytic geometry. The Columbia Encyclopedia, Sixth Edition. 2001
...quadrant, in analytic geometry, 1 In analytic geometry, one of the four regions of the plane determined by two lines, the x-axis and the y-axis. Commonly these lines...

15) plane geometry. The New Dictionary of Cultural Literacy, Third Edition. 2002
...plane geometry The study of two-dimensional figures (figures that are confined to a plane ). 1 Plane geometry is one of the oldest branches of mathematics. 2 The...

16) geometry. The New Dictionary of Cultural Literacy, Third Edition. 2002
...geometry The branch of mathematics that treats the properties, measurement, and relations of points, lines, angles, surfaces, and solids. (See Euclid and plane geometry.)...

17) Geometry (g soft). Dictionary of Phrase and Fable. 1898
...The first geometrician was a ploughman pacing out his field. (Greek, ge, the earth; metron, a measure.) 1...

18) sphere. The Columbia Encyclopedia, Sixth Edition. 2001
...sphere, in geometry, the three-dimensional analogue of a circle. The term is applied to the spherical surface, every point of which is the same distance (the radius)...

19) Riemannian geometry. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...A non-Euclidean system of geometry based on the postulate that within a plane every pair of lines intersects. After Georg Friedrich Bernhard Riemann....

20) plane geometry. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...The geometry of planar figures....