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134 lines
5.3 KiB
HTML
134 lines
5.3 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/protractor-using.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:43:35 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>Using a Protractor</title>
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<script src="images/construct.js" type="text/javascript"></script>
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<link rel="stylesheet" type="text/css" href="../stylejs.css">
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<meta name="keywords" content="math, maths, mathematics, school, homework, education">
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gtag('js', new Date());
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gtag('config', 'UA-29771508-1');
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</script>
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</head>
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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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<div id="adHide"></div>
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<div id="cookOK"></div>
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</header>
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<div class="mid">
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<nav>
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<div id="menuWide" class="menu"></div>
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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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<!-- #BeginEditable "Body" -->
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<h1 class="center">Using a Protractor</h1>
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<p>This is a protractor, it helps you measure<span class="center"> angles (in <a href="degrees.html">degrees</a>):</span></p>
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<div class="example" style="text-align:center;"><img src="images/protractor.svg" alt="Protractor" height="264" width="456"></div>
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<h2>Protractors are fun and easy to use</h2>
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<p>Have a look at this animation (press the play button) to see how to make a neat angle using a protractor and ruler:</p>
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<script>constructMain('pro50');</script>
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<!--<div class="flash">
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<script>putFlash6(404,344,'images/construct-angle-protractor.swf','','#FFFFFF');</script>
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<noscript>
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<object type="application/x-shockwave-flash" width="404" height="344" data="images/construct-angle-protractor.swf" align="middle">
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<param name="allowScriptAccess" value="sameDomain" /><param name="allowFullScreen" value="true" /><param name="movie" value="images/construct-angle-protractor.swf" /><param name="quality" value="high" /><param name="bgcolor" value="#FFFFFF" /></object>
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</noscript><br>
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<a href="javascript:FlashPHP(606,516,'images/construct-angle-protractor.swf','#FFFFFF')">View Larger</a>
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</div>
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--><h2>Measuring</h2>
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<div class="def">
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<p style="float:left; margin: 0 10px 5px 0;"><img src="images/protractor-2-angles.gif" alt="protractor 2 angles 70 and 110" height="158" width="277"></p>
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<p>Protractors usually have two sets of numbers going in opposite directions.</p>
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<p>Be careful which one you use!</p>
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<p>When in doubt think <i>"should this angle be bigger or smaller than 90° ?"</i></p>
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</div>
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<iframe src="iconstruct-prot110.html" scrolling="no" style="width:602px; height:442px; overflow:hidden; margin:auto; display:block; border: none;"></iframe>
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<h2>Have a Go Yourself!</h2>
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<p>Try to measure the angles <b>A, B</b> and<b> C</b> inside the triangle. Drag the protractor and rotate it using arrow keys.</p>
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<div class="script" style="height: 360px;">
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images/protractor-angle.js
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</div>
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<p>Be careful which angle you read from
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the protractor. <i>Hint: if you get them all correct,
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they will <a href="../proof180deg.html">add up to 180°</a></i>.</p>
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<p> </p>
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<div class="questions">1812, 1813, 1814, 1815, 3320, 3321, 3322, 3323, 3324, 3325</div>
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<div class="related">
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<a href="construct-ruler-triangle.html">Using a Ruler and Drafting Triangle</a>
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<a href="construct-ruler-compass-1.html">Using a Ruler and Compass</a>
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<a href="constructions.html">Geometric Constructions</a>
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<a href="degrees.html">Degrees (Angle)</a>
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<a href="interior-angles-polygons.html">Interior Angles of Polygons</a>
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<a href="../angle180.html">Angles On a Straight Line</a>
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<a href="supplementary-angles.html">Supplementary Angles</a>
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<a href="index.html">Geometry Index</a>
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</div>
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