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## Homework Statement

I'm doing quite a strict proof in school. Where we should proof something and use mathematical language and symbols.

## Homework Equations

## The Attempt at a Solution

To proof what I have to proof I need to draw some help lines. As for instance the "red" one I did from A to B. However I'm very unsure how to write this in mathematical symbols that I draw a helpline to form a triangle ABC (If you imagine that the intersection between A and B is called C.

Any tips on how to write this in a neet mathematical way?

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