Butterfly Theorem

Revision as of 13:23, 14 February 2009 by 1=2 (talk | contribs) (plz prove.)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Let $D$ be the midpoint of chord $BC$ of a circle, through which two other chords $EH$ and $FG$ are drawn. $EG$ and $HF$ intersect chord $BC$ at $I$ and $J$, respectively. The Butterfly Theorem states that $D$ is the midpoint of $IJ$.



This problem needs a solution. If you have a solution for it, please help us out by adding it.

See also

Invalid username
Login to AoPS