# Proof geometrically that QX and QY are the roots

http://img717.imageshack.us/img717/4...10106at123.png [Broken]

its a construction from felix klein, around 1900. it should be made without trigonometric functions or complex algebra etc.

the ratios of lengths should be sufficient, but i have only found one similar triangle and then i got stuck.

but is the best strategy to show that the lengths QX and QY are the roots?

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