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<h2>Define Angle </h2>

<br />

<div id="supi"><img src="images/angle.gif" alt="" width="30" height="28" border="1" align="left" /></div>

<p> Draw an angle mark. First the vertex of the angle must be drawn before. Select one side of the angle, then select the other. Then a angle mark from the first side to the second side is drawn with the degree of the angle near the mark. </p>

<p><img src="images2/angle1.gif" alt="angle1" width="150" height="150" border="1" /></p>

<p> Important Notice: </p>

<p> Here we are using full-angles instead of the traditional angles defined in geometry textbooks. Two full-angles are equal (congruent) iff they have: <br />

</p>

<ol>

<li> The same orientation and the same degree. <strong>Or</strong> <br />

</li>

<li> The opposite orientations and the sum of two angles is 180.<br />

</li>

</ol>

The full-angle method can automatically generate short (sometimes even shorter than those given by geometry experts) and elegant proofs of some extremely difficult theorems.

<h3>&nbsp;</h3>

<p>&nbsp;</p>

<p>&nbsp;</p>

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<p class="editdate">JGEX Help </p>