since two of the triangles are similar that means they are the same thing : <A = <L 108 = 108
<C is twice from <M so : <C is 2x < M is x
as you note down the answer you can draw two triangles and label them according to thier values, you will see that triangle ABC has two things now ; a = 108 and c = 2x when you have two measures in a triangle you can find the 3rd one : suppose that third < of triangle ABC is x ; 108 + 2x + x = 180 108 + 3x = 180 3x = 180 - 108 3x = 72 x = 24
<m = 24
further if you want to find C : < c = 2x < c = 2 ( 24 ) < c = 48