Find the bigger triangle first You are already giver 70 and 35 degrees. A triangle is 180 total 70+35=180 -75 So the two tips of the triangles that are touching are equal The knowledge you now have is 2x, x, and 75. You also know that the total has to be 180 2x+x+75=180 3x+75=180 -75 -75 3x=105 /3 /3 X=35
