# analytic geometry

In plane analytic geometry a line is frequently described in terms of its slope, which expresses its inclination to the coordinate axes; technically, the slope _{1}, _{1}) and (_{2}, _{2}) is given by _{2}−_{1}) / (_{2}−_{1}). The conic sections are treated in analytic geometry as the curves corresponding to the general quadratic equation ^{2}+^{2}+

In solid analytic geometry the orientation of a straight line is given not by one slope but by its direction cosines, λ, μ, and ν, the cosines of the angles the line makes with the ^{2}+μ^{2}+ν^{2}= 1. In the same way that the conic sections are studied in two dimensions, the 17 quadric surfaces, e.g., the ellipsoid, paraboloid, and elliptic paraboloid, are studied in solid analytic geometry in terms of the general equation ^{2}+^{2}+^{2}+

The methods of analytic geometry have been generalized to four or more dimensions and have been combined with other branches of geometry. Analytic geometry was introduced by René Descartes in 1637 and was of fundamental importance in the development of the calculus by Sir Isaac Newton and G. W. Leibniz in the late 17th cent. More recently it has served as the basis for the modern development and exploitation of algebraic geometry.

*The Columbia Electronic Encyclopedia,* 6th ed. Copyright © 2024, Columbia University Press. All rights reserved.

**See more Encyclopedia articles on: **Mathematics