document.write( "Question 1205790: 4 sided polygon with angles of 20x, 8(2x+9degrees), 36x . Determine the value of angle x \n" ); document.write( "
Algebra.Com's Answer #842819 by MathLover1(20849)\"\" \"About 
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\"4+\"sided polygon with angles of \r
\n" ); document.write( "\n" ); document.write( "\"20x\", \"8%282x%2B9%29\", \"36x+\"\r
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\n" ); document.write( "\n" ); document.write( " the sum of interior angles is always equal to \"360\" degrees\r
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\n" ); document.write( "\n" ); document.write( "you got the measures of three angles, so the measure of the fourth angle is\r
\n" ); document.write( "\n" ); document.write( "\"360-%2820x%2B8%282x%2B9%29%2B36x%29=72+%284+-+x%29\"\r
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\n" ); document.write( "\n" ); document.write( "the sum of all angles will be\r
\n" ); document.write( "\n" ); document.write( "\"360=%2820x%2B8%282x%2B9%29%2B36x%29%2B72+%284+-+x%29\".....solve for \"x\"\r
\n" ); document.write( "\n" ); document.write( "\"360=72x+%2B+72%2B288+-+72+x\"\r
\n" ); document.write( "\n" ); document.write( "\"360=360\"\r
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\n" ); document.write( "\n" ); document.write( "so, the statement above will be true for ANY value of\"+x\"\r
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