Answer: size and shape
Step-by-step explanation:
Hi, triangles are congruent if they have the same size and shape. It means that they have exactly the same three sides, and exactly the same three angles, but one may be a mirror image of the other.
Each part of the triangle (side or angle) is congruent to the corresponding part in the other triangle.
Feel free to ask for more if needed or if you did not understand something.
