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 #722236 by TeachMath(96) ![]() You can put this solution on YOUR website! \n" ); document.write( "the interior angles of a pentagon (5-sided polygon) add up to 540 degrees, not 720 degrees. \n" ); document.write( "that person (stanbon) is wrong, and the correct answer is 140 degrees. \n" ); document.write( " |