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Circle Power 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
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