Art of Problem Solving

Two Tangent Theorem: Difference between revisions

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The two tangent theorem states that given a circle, if P is any point lying outside the circle, and if A and B are points such that PA and PB are tangent to the circle, then PA = PB.
The two tangent theorem states that given a circle, if P is any point lying outside the circle, and if A and B are points such that PA and PB are tangent to the circle, then PA = PB.
<geogebra>4f007f927909b27106388aa6339add09df6868c6</geogebra>
Hello


It follows from [[Power of a Point]] trivially, or we can use similar triangles, given that tangents to a circle form a right angle to the radius to the point of tangency.
== Proofs ==
=== Proof 1 ===
Since <math>OBP</math> and <math>OAP</math> are both right triangles with two equal sides, the third sides are both equal.


=== Proof 2 ===
From a simple application of the [[Power of a Point Theorem(or Power Point Theorem)]], the result follows.
==See Also==
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{{stub}}
[[Category:Geometry]]
[[Category:Geometry]]
[[Category: Theorems]]

Latest revision as of 23:39, 2 November 2025

The two tangent theorem states that given a circle, if P is any point lying outside the circle, and if A and B are points such that PA and PB are tangent to the circle, then PA = PB. <geogebra>4f007f927909b27106388aa6339add09df6868c6</geogebra> Hello

Proofs

Proof 1

Since $OBP$ and $OAP$ are both right triangles with two equal sides, the third sides are both equal.

Proof 2

From a simple application of the Power of a Point Theorem(or Power Point Theorem), the result follows.

See Also

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