Question

Things which concide with one another are equal to one another. Tell it's meaning with proof to it....!.?..!?..

Answer 1

Things which concide with one another are equal to one another
This statement is an axiom hence it does not have/need a proof.
It means that two things that are same can be considered to be equal.
For example if one angle = 90 degree and another angle also = 90 degree then we can say both angles are equal.

Hope this helps :)