Question

In the following figure , OA = OC and AB = BC ,
prove that :
AD = CD

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Easy

Solution

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In the figure
We need to prove that

In and
      [given ]
               [common]
           [given]
By Side - Side - Side criterion of congruence , we have 

The corresponding parts of the congruent triangles are congruent
       [C.P.C,T]     

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