document.write( "Question 1107197: Four of the interior angle of a pentagon are 80-y°, 80+y°,120-y°,120+y°. The size of the 5th interior angle must be??? \n" ); document.write( "
Algebra.Com's Answer #722193 by stanbon(75887)\"\" \"About 
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Four of the interior angle of a pentagon are 80-y°, 80+y°,120-y°,120+y°. The size of the 5th interior angle must be???
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\n" ); document.write( "The sum of the interior angles of a pentagon are (5-1)*180 = 720 degrees
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\n" ); document.write( "Equation::
\n" ); document.write( "80-y + 80+y + 120-y + 120+y + 5th = 720
\n" ); document.write( "200+200 + 5th = 720
\n" ); document.write( "5th = 320 degrees
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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