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Topic: Help in Geometry
Replies: 3   Last Post: Aug 29, 2006 3:04 AM

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Wong wane young

Posts: 1
From: HK
Registered: 7/12/06
Help in Geometry
Posted: Jul 12, 2006 5:27 AM
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I am encountering 2 questions from my professor. Can anybody help me?? I really have no idea about them. Thx!

1. The incircle of triangle ABC touch sides AB,BC, CA at M,N,K, respectively. The line through A
parallel to NK meets MN at D. The line through A parallel to MN meets NK at E. Show that the
line DE bisects sides AB and AC of triangle ABC.

2. In triangle ABC, AB = AC and the angle bisector of C meets AB at D. The perpendicular to CD
through the center of the circumcircle of ABC intersects BC at E. The parallel to CD through E meets
AB at F. Show that BE = FD.

Thx alot!!!

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