February 7th, 2009, 05:07 PM  #1 
Newbie Joined: Feb 2009 Posts: 1 Thanks: 0  Geometry Help Urgent!!! 
February 8th, 2009, 11:16 AM  #2 
Newbie Joined: Feb 2009 Posts: 25 Thanks: 0  Re: Geometry Help Urgent!!!
The way i saw it was that the line TO sort of acts as a line of reflection by preserving all of the angles and since it is the radius of the circle, the top semi circle is reflected also. This is by no means a proof though.

February 8th, 2009, 01:15 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,969 Thanks: 2219 
Triangles OPT, ORT are congruent (side, side, angle, not ambiguous as the larger of these sides is opposite the angle), so PT = RT. Similarly, ST = TQ.


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