# Three similar right triangles

There are three right triangles in this diagram, and they are all similar. Can you identify them?
To see that the small and medium triangles are similar, click the check box at top left, then slide the sliders to the right, in order from top to bottom.
Repeat with the right hand check box for the medium and large triangles.

Can you prove this?
Hint: click the "Show angles" check box.

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