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Label the square ABCD clockwise starting at the upper left corner.

Put Y next to the angle of 70 (I will use both X and Y as angles and as points).


Rotate ABY over AY.
Rotate ADX over AX.

ABY and ADX will exactly cover AXY - proof is left to the reader as exercise.

-> X=180-45--70=65


Edited by harey
Corrected a germanism.
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