A point related to the construction and properties of conic sections. Hyperbolas and noncircular ellipses have two distinct foci and two associated conic section directrices, each directrix being perpendicular to the line joining the two foci (Eves 1965, p. 275).
See alsoConic Section Directrix,
Eccentricity,
Ellipse,
Ellipsoid,
Focal Parameter,
Hyperbola,
Hyperboloid,
Parabola,
Paraboloid,
Reflection Property Explore with Wolfram|Alpha ReferencesCoxeter, H. S. M. and Greitzer, S. L. Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 141-144, 1967.Eves, H. "The Focus-Directrix Property." ยง6.8 in A Survey of Geometry, rev. ed. Boston, MA: Allyn & Bacon, pp. 272-275, 1965. Referenced on Wolfram|AlphaFocus Cite this as:Weisstein, Eric W. "Focus." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Focus.html
Subject classificationsRetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4