document.write( "Question 303677: one angle of a triangle measures 12 degrees. the second angle's measurement is five times the third. what is the measure of the third angle? \n" ); document.write( "
Algebra.Com's Answer #217613 by graphmatics(170)![]() ![]() You can put this solution on YOUR website! Express the first, second, and third angles of the triangle be expressed as x, y, and Z. From the first sentence x=12. From the second sentence y=5z. For triangles the sum of the angles of a triangle is 180. So we get three linear equations\r \n" ); document.write( "\n" ); document.write( "x = 12 \n" ); document.write( "y = 5z \n" ); document.write( "x+y+z = 180\r \n" ); document.write( "\n" ); document.write( "Put the expressions for x and y fron the first and second equations into the third equation to get\r \n" ); document.write( "\n" ); document.write( "12+5z+z = 180 \n" ); document.write( "6z = 180-12 \n" ); document.write( "6z = 168\r \n" ); document.write( "\n" ); document.write( "So the third angle measurement, z, is\r \n" ); document.write( "\n" ); document.write( "z=28. \n" ); document.write( " |