Doubt problem


 

  1. #1 by siddhant on December 31, 2013 - 7:20 pm

    two circles C(O,r) and C'(O’,r’)touch externally.show that the square of length of the common tangent (not through the the point of contact of circles )is 4rr’ .

  2. #2 by dipesh kumar on January 7, 2014 - 3:47 pm

    Given a base of a triangle and the sum of its sides,prove that the locus of the centre of its incircle is an ellipse.

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