Question

what is the criteria of congruency

Answer 1

there are 5 criteria for congruency
1.SSS(side-side-side)
2.SAS(side-angle-side)
3.ASA(angle-side-angle)
4.AAS(angle-angle-side)
5.RHS(right angle-hypotenuse-side)

Answer 2

There are following criterias for the congruence of triangles:-
a) SSS criteria - Side-Side-Side criteria
If all three sides of a triangle are equal to their corresponding sides of another triangle, then the two triangles are congruent.
b) SAS criteria - Side-Angle-Side criteria
If two sides and their including angle of a triangle are equal to the corresponding sides and angle of another triangle, then the two triangles are congruent.
c) AAS criteria- Angle-Angle-Side
If two angles and a side of a triangle are equal to their corresponding side and angles of another triangle, then the two triangles are congruent.
d) RHS criteria - Right angle-Hypotenuse-Side criteria
Two right triangles are congruent to each other when their hypotenuse and a corresponding side along with the right angle are equal.

Hope helped....