document.write( "Question 848367: The second angle in a triangle is half as large as the first. The third angle is three times as large as the second. Find the angle measures \n" ); document.write( "
Algebra.Com's Answer #511071 by pmesler(52)![]() ![]() You can put this solution on YOUR website! First, remember that the sum of all the angles in a triangle must equal 180 degrees. \r \n" ); document.write( "\n" ); document.write( "Let x = the measure of the first angle\r \n" ); document.write( "\n" ); document.write( "Let x/2 = the measure of the second angle\r \n" ); document.write( "\n" ); document.write( "Let 3x/2 = the measure of the third angle. \r \n" ); document.write( "\n" ); document.write( "Therefore \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x + x/2 + 3x/2 = 180. Now solve for x. Once you find x, you will find the measure for all three angles.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x + x/2 + 3x/2 = 180 \r \n" ); document.write( "\n" ); document.write( "= x+ 4x/2 = 180\r \n" ); document.write( "\n" ); document.write( "Multiply each side of the equation by 2 to get rid of the 2 in the denominator.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2[x + 4x/2] = 2(180).\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2x + 4x = 360\r \n" ); document.write( "\n" ); document.write( "6x = 360\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Divide each side by 6\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 60. \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Therefore the first angle x, is 60 degrees. The second angle, x/2 = 60/2 = 30 degrees. The third angle 3x/2 = 3(60)/2 = 90. \r \n" ); document.write( "\n" ); document.write( "60 + 30 + 90 = 180 so everything is correct. \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |