chk for origin inside rectangle and square

From: Sudershan (suder54_at_sify.com)
Date: 12/31/03 

Date: 31 Dec 2003 05:11:30 -0800

hai group,

i am having program.to find from 4 points which is co ordinate of
rectangle,wether origin is inside or not.

 same problem for triangle.

pl say how it could be done and how it works.