Question

what is a definition of congruent triangle

Answer 1

CONGRUENT TRIANGLES -When two triangles are congruent they will have exactly the same three sides and exactly the three same angles.
the equal sides and angles may not be in the same position (if there is a turn or a flip)but they are there.
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Answer 2

look... meaning of 'congruent' is 'equal in all respects whose shapes and sizes are both same' , so it means two triangles whose all angles and sizes are same are said to be congruent triangles .