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97 lines
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HTML
97 lines
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<h1 class="center">Tangent Lines and Secant Lines</h1>
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<p class="center"><i>(This is about lines, you might want the <a href="../sine-cosine-tangent.html">tangent and secant functions</a>)</i></p>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="images/secant-line.svg" alt="Secant (line)"></p>
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<p class="dotpoint">A <span class="center"><b>tangent</b></span><b> line</b> just touches a curve at a point, matching the curve's slope there.
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(From the Latin <i><b>tangens</b></i> "touching", like in the word "tangible".)<br>
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<p class="dotpoint">A <b>secant line</b> intersects two or more points on a curve. (From the Latin <i><b>secare</b></i> "cut or sever")</p>
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<p>They are <a href="line.html">lines</a>, so extend in both directions infinitely.</p>
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<h2>Circle</h2>
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<p>On a circle they look like this:</p>
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<h2>Theorems</h2>
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<p>There are three theorems of interest here:</p>
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<ul>
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<li> <a href="circle-intersect-secants-line.html">Intersecting Secants Theorem</a></li>
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<li><a href="circle-intersect-chords.html">Intersecting Chords Theorem</a></li>
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<li><a href="circle-intersect-secants-angle.html">Angle of Intersecting Secants Theorem</a></li>
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