document.write( "Question 623590: Where did the 180-x which is the value of exterior angle came from? It is from the solution of this question:
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Algebra.Com's Answer #392208 by math-vortex(648)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Hi, there--\r\n" );
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document.write( "Thank you for your clarifying question. \r\n" );
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document.write( "When you extend a side in a triangle, then a linear pair of angles automatically appears. \r\n" );
document.write( "Linear pairs are angles that are adjacent and supplementary.\r\n" );
document.write( "Adjacent means that they share a common side.\r\n" );
document.write( "Supplementary means that the sum of their measures is 180 degrees.\r\n" );
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document.write( "One of the angles in the linear pair is an interior angle in the triangle, and its supplement is \r\n" );
document.write( "called an exterior angle of the triangle.\r\n" );
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document.write( "Here is a link to a pretty nice picture of what I'm talking about:\r\n" );
document.write( "http://hotmath.com/hotmath_help/topics/exterior-angle-theorem.html\r\n" );
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document.write( "In vksarvepalli's solution, he assigned the variable x to be the measure of the interior angle. \r\n" );
document.write( "Since the interior angle and the exterior angle form a linear pair, they are supplementary. \r\n" );
document.write( "This means that the measure of the exterior angle will be 180-x because x + (180-x) = 180.\r\n" );
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document.write( "Hope this helps! Feel free to email me if you still have questions about this.\r\n" );
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document.write( "Ms.Figgy\r\n" );
document.write( "math.in.the.vortex@gmail.com\r\n" );
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