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Intermediate

The side mirror

An isosceles triangle and an external point with three line segments. Prove that the red points form a cyclic quadrilateral.

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Solution

Solution by Hung Le Huu.

Poem

Side mirror
A wave sneaks up
In the long corridor
Drawn to the end of the black tunnel
Strange atmosphere of a mirror
Which reflects the light to be seen
The distances are reversed
The colours are reflected
The mystery remains with this side step

Bella

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