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Classe GeoGebra

Coxeter- Theorem 7.61

Auteur :willgiesbarton

Thème :Géometrie

Consider the quadrilateral

with

conjugate to

and

to

. The polars

and

pass through

and

, respectively. By Theorem 7.31, the polar of

meets

in a point that lies on

, namely in the point

. Therefore the polar of

passes through

so they are conjugates.

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