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130 lines
6.1 KiB
HTML
130 lines
6.1 KiB
HTML
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<title>Degrees (Angles)</title>
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<h1 align="center">Degrees (Angles)</h1>
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<div style="float:left; margin: 0 10px 5px 0;">
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<script type="text/javascript">anglesMain();</script>
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</div>
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<p> </p>
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<h3>We can measure Angles in Degrees.</h3>
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<p>There are 360 degrees in one Full Rotation (one
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complete circle around).</p>
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<p>(Angles can also be measured in <a href="radians.html">Radians</a>)</p>
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<div style="clear:both"></div>
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<p align="center"><i>(Note: "Degrees" can also mean <a href="../temperature-conversion.html">Temperature</a>, but here we are talking about Angles)</i></p>
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<h2>The Degree Symbol: °</h2>
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<p>We use a little circle ° following the number to mean degrees.</p>
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<p>For example <b>90°</b> means <b>90 degrees</b></p>
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<h2>One Degree</h2>
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<p align="center"><img src="images/degrees-1.gif" width="600" height="45" alt="1 Degree" /><br />
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<b>This is how large 1 Degree is</b></p>
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<p style="float:left; margin: 0 10px 5px 0;"><img src="images/degrees-360.gif" width="344" height="339" alt="Full Circle Degrees" /> </p>
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<p> </p>
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<h2>The Full Circle</h2>
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<p>A <a href="full-rotation.html">Full Circle</a> is 360<b>°</b></p>
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<p>Half a circle is 180°<b><br />
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</b>(called a <a href="straight-angle.html">Straight Angle</a>)</p>
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<p>Quarter of a circle is 90°<br />
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(called a <a href="../rightangle.html">Right Angle</a>)</p>
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<tr>
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<td><img src="../images/style/question.svg" width=50 alt="question" /></td>
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<td><p><b>Why 360 degrees?</b> Probably because old calendars (such as the Persian Calendar) used 360 days for a year - when they watched the stars they saw them revolve around the North Star one degree per day.</p>
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<p>Also 360 can be <a href="../numbers/factors-all-tool.html">divided exactly</a> by 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120 and 180, which makes a lot of basic geometry easier.</p></td>
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</tr>
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</table>
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</div>
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<h2>Measuring Degrees</h2>
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We often <a href="../angles.html">measure degrees</a> using a protractor:
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<p align="center"><img src="images/protractor.svg" alt="Protractor" /><br />
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The normal protractor measures 0° to 180°</p>
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<table border="0" align="center">
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<tr>
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<td><img src="images/full-cirle-protractor.jpg" width="200" height="207" alt="Full Circle Protractor" /></td>
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<td><p>There are also full-circle protractors. </p>
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<p>But they are not as commonly used because they are a bit big and don't do anything special.</p></td>
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</tr>
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</table>
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<p> </p>
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<div class="questions">
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<script type="text/javascript">getQ(1771, 1772, 1773, 1774, 1775, 3280, 3281, 3282, 3283, 8990);</script> </div>
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<div class="related"> <a href="../angles.html">Types of Angles</a> <a href="radians.html">Radians</a> <a href="plane.html">Plane</a> <a href="symbols.html">Symbols in Geometry</a> <a href="index.html">Geometry Index</a> </div>
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Copyright © 2018 MathsIsFun.com
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