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) ![]() You can put this solution on YOUR website! 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( "----- \n" ); document.write( "The sum of the interior angles of a pentagon are (5-1)*180 = 720 degrees \n" ); document.write( "============== \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 \n" ); document.write( "------------- \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "---------- \n" ); document.write( " |