[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[obm-l] Quadrilatero Circunscritivel



Oi, pessoal:

Um amigo me mandou este aqui, o qual nao me parece muito trivial...

Let ABCD be a quadrilateral with an inscribed circle with center O (all
sides of the quadrilateral are tangent to the circle).  Assume that O does
not lie on AC.  Construct a line through E on BD perpendicular to BD.
Then this line meets OA at R and OC at S.  Show that |ER|=|ES|.

[]s,
Claudio.

=========================================================================
Instruções para entrar na lista, sair da lista e usar a lista em
http://www.mat.puc-rio.br/~nicolau/olimp/obm-l.html
=========================================================================