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Intersecting secants theorem
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<h2 id="external-links">External links</h2> <ul><li><a href="https://proofwiki.org/wiki/Secant_Secant_Theorem"><i>Secant Secant Theorem</i></a> at proofwiki.org</li> <li><a href="http://www.cut-the-knot.org/pythagoras/PPower.shtml"><i>Power of a Point Theorem</i></a> auf cut-the-knot.org</li> <li><a href="/facts/Eric_W._Weisstein/FbMuVDep">Weisstein, Eric W.</a> <a href="https://mathworld.wolfram.com/Chord.html">"Chord"</a>. <i><a href="/facts/MathWorld/yc1jodbq">MathWorld</a></i>.</li></ul>