document.write( "Question 326373: each interior of regular polygon is 90 less than five times the measure of each exterior angle. how many sides does the polygon have? \n" ); document.write( "
Algebra.Com's Answer #233724 by vksarvepalli(154) You can put this solution on YOUR website! let the value of each interior angle be x\r \n" ); document.write( "\n" ); document.write( "then the value of each exterior angle will be 180-x\r \n" ); document.write( "\n" ); document.write( "now it is given that \r \n" ); document.write( "\n" ); document.write( " each interior angle is 90 less than five times the measure of each exterior angle.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "so x=5(180-x)-90\r \n" ); document.write( "\n" ); document.write( " => x=900-5x-90 \n" ); document.write( " => 6x=900-90 \n" ); document.write( " => x=150-15 \n" ); document.write( " => x=135\r \n" ); document.write( "\n" ); document.write( "now the value of the interior angle of a regular polygon of \n" ); document.write( "n sides is given by \r \n" ); document.write( "\n" ); document.write( " 180(n-2)/n degrees\r \n" ); document.write( "\n" ); document.write( "so here 180(n-2)/n = 135\r \n" ); document.write( "\n" ); document.write( " => 180n-360=135n \n" ); document.write( " => 45n=360\r \n" ); document.write( "\n" ); document.write( "so n=8\r \n" ); document.write( "\n" ); document.write( "The no. of sides of the polygon = 8\r \n" ); document.write( "\n" ); document.write( "so it is an octagon \n" ); document.write( " |