An isosceles triangle those sides are 13cm,13cm,10cm long inscribed in a circle.find the radius of the circle  Choose the correct choice from the following options: A) 8 cm B) 9 cm C) 10 cm D) 11 cm E) 7 cm

Rationale: a , b , c are sides of triangle , ad is the median , ad ^ 2 = ab ^ 2 - bd ^ 2 then ad = 12 , the centriod median divides into 2 : 1 ratio so 12 will be divide into 2 : 1 ratio so 8 is radius . so ans is 8 cm answer : a
Answer: A