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149 lines
5.6 KiB
HTML
149 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="en"><!-- #BeginTemplate "/Templates/Main.dwt" --><!-- DW6 -->
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<!-- Mirrored from www.mathsisfun.com/geometry/plane.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:37:34 GMT -->
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<!-- #BeginEditable "doctitle" -->
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<title>What is a Plane?</title>
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<meta name="keywords" content="math, maths, mathematics, school, homework, education">
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<body id="bodybg">
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<div id="stt"></div>
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<div id="adTop"></div>
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<header>
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<div id="hdr"></div>
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<div id="tran"></div>
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</header>
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<div class="mid">
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<nav>
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<div id="logo"><a href="../index.html"><img src="../images/style/logo.svg" alt="Math is Fun"></a></div>
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<article id="content" role="main">
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<h1 class="center">Plane</h1>
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<h3 align="center">A plane is a flat surface with no thickness.</h3>
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<p style="float:left; margin: 0 25px 0 5px;"><img src="images/plane.jpg" alt="plane" height="237" width="242"></p>
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<p>Our world has three dimensions, but there are <b>only two dimensions on a plane</b>:</p>
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<p class="center center80"><b>length</b> and <b>width</b> make a plane</p>
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<p class="center center80"><b>x</b> and <b>y</b> also make a plane</p>A plane has no thickness, and goes on forever.
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<div style="clear:both">
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</div>
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<h2>Examples</h2>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="images/plane.svg" alt="plane" height="109" width="250"></p>
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<p>It is actually hard to give a real example!</p>
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<p>When we draw something on a flat piece of paper we are drawing on a plane ...</p>
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<p>... except that the paper itself is not a plane, because it has thickness! And it should extend forever, too.</p>
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<p> </p>
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<p class="center large">So the very top of a perfect flat piece of paper<br>
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that goes on forever is the right idea!</p>
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<p> </p>
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<p>Also, the top of a table, the floor and a whiteboard are all <i>like</i> a plane.</p>
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<p class="center">Here you can spin part of a plane:</p>
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<div class="script" style="height: 450px;">
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images/polyhedra.js?mode=plane
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</div>
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<p> </p>
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<p>A plane has <b>2 Dimensions</b> (and is often called <b>2D</b>):</p>
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<p style="float:left; margin: 0 20px 0px 0px;"><a href="dimensions.html"><img src="images/dimensions.svg" alt="dimensions" height="148" width="305"></a></p>
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<h3>Point, Line, Plane and Solid</h3>
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<p>A <a href="point.html">Point</a> has no dimensions, only position<br>
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A <a href="line.html">Line</a> is one-dimensional<br>
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<b>A Plane is two dimensional (2D)</b><br>
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A <a href="solid-geometry.html">Solid</a> is three-dimensional (3D)</p>
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<div style="clear:both"></div>
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<p> </p>
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<div class="words">
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<p><b>Plane vs Plain</b></p>
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<p>In geometry a "plane" is a flat surface with no thickness.</p>
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<p>But a "plain" is a treeless <b>mostly flat expanse of land</b> ... it is also flat, but not in the pure sense we use in geometry.</p>
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<p>Both words have other meanings too:</p>
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<ul>
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<li>Plane can also mean an airplane, a level, or a tool for cutting things flat</li>
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<li>Plain can also mean without special things, or well understood</li>
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</ul>
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</div>
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<h2>Imagine</h2>
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<p style="float:left; margin: 0 20px 0px 0px;"><img src="images/2d-world.svg" alt="2d world" height="201" width="219"></p>
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<p>Imagine you lived in a two-dimensional world. You could travel places, visit friends, but nothing in your world has height.</p>
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<p>You could measure distances and angles.</p>
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<p>You could go fast or slow. You could go forward, backwards or sideways. You could move in straight lines, circles, or anything, so long as you never go up or down.</p>
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<p>What would life be like living on a plane?</p>
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<p> </p>
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<p><br></p>
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<div class="related">
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<a href="../shape.html">Plane Shapes</a>
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<a href="../area.html">Area of Plane Shapes</a>
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<a href="../area-calculation-tool.html">Area Calculation Tool</a>
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<a href="../angles.html">Types of Angles</a>
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<a href="degrees.html">Degrees (Angle)</a>
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<a href="symbols.html">Symbols in Geometry</a>
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<a href="index.html">Geometry Index</a>
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</div>
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<!-- #EndEditable -->
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</article>
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<div id="adend" class="centerfull noprint"></div>
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<footer id="footer" class="centerfull noprint"></footer>
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<div id="copyrt">Copyright © 2022 Rod Pierce</div>
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