From Biocrawler, the free encyclopedia.
In
geometry,
circle power (or the
power of a circle) is the
power of a point with respect to a given
circle. In more specific terms, the power of a point
A for a circle of radius
r and center
O is defined as:
- p ≡ AP × QA
where P and Q are the points forming a line with A and intersecting the circle. This can also be expressed as
- p = AO² − r²
Note that p is actually independent of the specific line APQ.
External links
 Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Circle_power (http://en.wikipedia.org/wiki/Circle_power) version history (http://en.wikipedia.org/w/index.php?title=Circle_power&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License)  CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)
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