Find the unknown marked angles Share with your friends Share 0 Ankita Agarwal answered this Dear Student, Let the third angle in the triangle be x°Sum of angles along a straight line is 180°135+x = 180x = 180-135x = 45°sum of angles of a triangle = 180°73+45+a= 180118+a = 180a = 180-118a = 62° Regards 0 View Full Answer