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127 lines
5.1 KiB
HTML
127 lines
5.1 KiB
HTML
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<head>
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<title>Angles on a Straight Line Add to 180</title>
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<meta name="description" content="Angles on one side of a straight line always add to 180 degrees" />
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<body id="bodybg">
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<div class="bg">
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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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<div id="content" role="main"><!-- #BeginEditable "Body" -->
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<h1 align="center">Angles On One Side of A Straight Line</h1>
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<p class="center large">Angles on one side of a straight line always add to <b>180 degrees</b> </p>
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<p> </p>
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<p class="center"> <img src="geometry/images/angle180.svg" alt="angle 180 degrees" /><br />
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<span class="large">30° + 150° = <b>180° </b></span> </p>
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<p>When a line is split into 2 and we know one angle, we can always
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find the other one. </p>
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<div class="example">
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<h3>Example: We know one angle is 45°, what is the other angle <b>"a"</b> ?</h3>
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<table border="0" align="center">
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<tr>
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<td><img src="geometry/images/angle45.svg" alt="angle 45 degrees" /></td>
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<td>Angle <b>a</b> is 180° − 45° =
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<b>135°</b> </td>
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</tr>
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</table>
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</div>
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<p> </p>
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<p>This method can be used for several angles on one side of a straight
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line.
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</p>
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<div class="example">
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<h3>Example: What is angle <b>"b"</b> ?</h3>
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<table border="0" align="center">
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<tr>
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<td><img src="geometry/images/angleb.svg" alt="angle b" /></td>
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<td>
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<p>Angle <b>b</b> is <b>180° minus the
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sum of the other angles</b>.</p>
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<p>Sum of known angles = 45° + 39° + 24°
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<br />
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Sum of known angles = 108° </p>
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<p> Angle <b>b</b> = 180° − 108°<br />
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Angle <b>b</b> = 72°
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</p></td>
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</tr>
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</table>
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</div><p> </p>
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<script type="text/javascript">getQ(1752, 1753, 823, 3311, 3312, 3313, 8994, 8995, 8996, 824);</script>
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</div>
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<div class="related">
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<a href="geometry/straight-angle.html">Straight Angle</a>
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<a href="geometry/supplementary-angles.html">Supplementary Angles</a>
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<a href="angle360.html">Angles Around a Point</a>
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<a href="angles.html">Types of Angles</a>
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<a href="geometry/degrees.html">Degrees (Angle)</a>
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<a href="geometry/index.html">Geometry Index</a>
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</div>
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Copyright © 2017 MathsIsFun.com
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