Answer:

1. by listing their vertices in corresponding orders
2. of the side by side by side is equal or triangle have the same measurements as three sides

Step-by-step explanation:

Congruent Triangles

• Triangles that have exactly the same size and shape are called congruent triangles. The symbol for congruent is ≅. Two triangles are congruent when the three sides and the three angles of one triangle have the same measurements as three sides and three angles of another triangle.

for more info see the picture above