All three triangles are congruent. This is because they share the same set of angles and corresponding side lengths.
Observing the provided diagram, we can determine that all three triangles, namely triangle 1, triangle 2, and triangle 3, are congruent. This is because they share the same set of angles and corresponding side lengths.
Triangle 1 and triangle 2 have congruent angles of 70 degrees and 70 degrees, with a common side length connecting these angles. This implies that the remaining side length in triangle 1 is also congruent to the corresponding side length in triangle 2. Similarly, triangle 2 and triangle 3 share congruent angles of 70 degrees and 70 degrees, with a common side length connecting these angles. This also implies that the remaining side lengths in triangle 2 are congruent to the corresponding side lengths in triangle 3.
By the SSS (Side-Side-Side) congruence postulate in geometry, if all three pairs of corresponding sides in two triangles are equal in length, then the triangles are congruent. Since all three triangles in the given diagram exhibit the same side lengths and angle measures, they are considered congruent triangles.