What do you mean by corner, corner and edge? Don't tell me.
It is often used to prove that two triangles are congruent, that is, the judgment basis when two triangles are the same. Corner edge, two angles and the adjacent edge of an angle are the same, then these two triangles are congruent; The angles formed by the angle side, two sides and two sides are the same, so these two triangles are congruent.