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119 lines
5.9 KiB
HTML
119 lines
5.9 KiB
HTML
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<head>
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<!-- #BeginEditable "doctitle" -->
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<title>Interactive Polygons</title>
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<script src="images/area-coords.js" type="text/javascript"></script>
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<link rel="stylesheet" type="text/css" href="../stylejs.css" />
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<script language="JavaScript" type="text/javascript">reSpell=[["center","centre"]];</script>
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<meta name="description" content="Play with a polygon! Try different polygons from triangles up, and see their lengths, angles and coordinates." />
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<h1 class="center">Interactive Polygons</h1>
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<p class="center">Play with a polygon! Try adding or subtracting points. See different polygons from triangles up.<br />
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See the lengths, angles and coordinates, too.<br />
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</p>
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<p> </p>
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<script type="text/javascript">areacoordsMain('type');</script> <p> </p>
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<p><i>Note: due to computer rounding errors the last digit is not always correct.</i></p>
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<script type="text/javascript">putFlash6(640,500,'images/area-coords.swf','','#FFFFFF');</script>
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<!-- <h3>Zooming</h3>
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<p>You can draw a rectangle to zoom in, or use the "Zoom" buttons. "Fit" is very useful.</p>
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<h3>Moving</h3>
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<p>Click on the drawing surface to change the center of drawing. Or zoom out and draw a rectangle.</p>
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<h3>Fine Adjustments</h3>
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<p>Draw a small rectangle around a point so you can then position it accurately. Zoom "Fit" to see whole polygon again so you can then zoom in to another point.</p>-->
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<h3>Edit</h3>
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<p>Use the "Edit" button to manually edit the coordinates, or to <b>enter new coordinates of your own</b>.</p>
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<h2>What is Regular, Concave, Complex?</h2>
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<p class="center"><img src="images/polygon-types.svg" alt="polygon regular, irregular, concave, complex" /></p>
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<p>When all angles are equal and all sides are equal it is <b>regular</b>, otherwise it is<b> irregular</b></p>
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<p>When any internal angle is greater than 180° (it points inwards) then it is <b>concave</b>. (<i>Think: concave has a "cave" in it</i>), otherwise it is <b>convex</b>.</p>
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<p>And a <b>complex</b> polygon intersects itself (the boundary crosses over), otherwise it is <b>simple</b> (like most polygons we deal with). Many rules about polygons don't work when they are complex. </p>
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<p> </p>
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<div class="related">
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<a href="triangles-interactive.html">Interactive Triangles</a>
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<a href="quadrilaterals-interactive.html">Interactive Quadrilaterals</a>
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<a href="index.html">Geometry Index</a>
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Copyright © 2018 MathsIsFun.com
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