Answers

2014-11-23T18:49:23+05:30
 a circle with centre 'o'
 AB is thee diameter.
PQ&RS are the tangents of the circle and point of contact is A,B end points of a diameter
R.T.P:- PQ//RS
Proof:-we know that 
       PQ PERPENDICULAR TO AB....................1
       RS PERPENDICULAR TO AB....................2
              PQ//RS (.. The lines PQ and RS are coplanar the interior on the same side of transversal are 180 degrees)
      

hope this will help you
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