condition for collinear

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MATHPRITOM
Posts:190
Joined:Sat Apr 23, 2011 8:55 am
Location:Khulna
condition for collinear

Unread post by MATHPRITOM » Thu Mar 08, 2012 9:03 am

This post is for posting the conditions for collinear . In math Olympiads, we often face the problems where we need to prove some points are collinear . Here , we will give conditions for collinear . Thus, we can get all the conditions for collinear . I am starting below. Members are requested to post the conditions which are not posted before. Thanks all.
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MATHPRITOM
Posts:190
Joined:Sat Apr 23, 2011 8:55 am
Location:Khulna

Re: condition for collinear

Unread post by MATHPRITOM » Thu Mar 08, 2012 9:08 am

1. angle chase .
2. Menelaus.
3.Desargues' theorem .
4.
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