IMO Shortlist 2005 problem G6
Kvaliteta:
Avg: 0,0Težina:
Avg: 8,0 Let
be a triangle, and
the midpoint of its side
. Let
be the incircle of triangle
. The median
of triangle
intersects the incircle
at two points
and
. Let the lines passing through
and
, parallel to
, intersect the incircle
again in two points
and
. Let the lines
and
intersect
again at the points
and
. Prove that
.
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Izvor: Međunarodna matematička olimpijada, shortlist 2005