Can you label the triangle and tell me which are the two triangles that are similar
It will be a few days before I can scan anything in so in the meantime I will try to describe the diagram in more detail.
Look at the big right angled triangle that I have drawn (this represents one of the quarters of the rhombus). The radius of the circle touches the hypotenuse of the triangle and makes a right angle with it (because it is the tangent to the circle drawn in the question). This line splits the big triangle up into two: one small one at the bottom and a tiny one at the top. The tiny triangle shares an angle with the big one (top right), and they both also have a right angle, therefore all three of their angles are the same, and so they are similar.
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