Conventionally you use the symbol that looks like an "equals" sign but consists of three lines. It is the same symbol as is used for identities.
ABC ≡ PQR
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If I understand the question correctly, the answer is yes. Thanks to the transitive property of congruence.
A pair of triangles can form a 4 sided quadrilateral
I think it is either a right triangle, square, pentagon, or rectangle.
Equilateral triangle ,acute triangle
Any one pair of their corresponding angles are equal.