document.write( "Question 1117316: the sum of the polygon is 20 right angle. How many sides does the polygon have? \n" ); document.write( "

Algebra.Com's Answer #732351 by ikleyn(52908) $\"\"$ $\"About$

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\n" ); document.write( "the sum of the $\"highlight%28interior%29\"$ $\"highlight%28angles%29\"$ $\"highlight%28of%29\"$ $\"highlight%28the%29\"$ polygon is 20 right angles. How many sides does the polygon have?
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document.write( "We are given that the sum of interior angles of the polygon is 20*90° = 1800°.\r\n" );
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document.write( "There is the formula for the sum of interior angles of a polygon via the number of its sides\r\n" );
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document.write( "S = (n-2)*180°.\r\n" );
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document.write( "Thus you have an equation to find \"n\":\r\n" );
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document.write( "(n-2)*180° = 1800°.\r\n" );
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document.write( "It gives you n - 2 =  = 10.\r\n" );
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document.write( "Hence, n = 12 + 2 = 12.\r\n" );
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document.write( "Answer.  The number of sides of the polygon is 12.\r\n" );
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