Are these triangles congruent ?
And what is the theorem ?

Answer:
Yes, they are congruent. Theorem: SSS
Step-by-step explanation:
The triangles are congruent because it is given that they have 2 sides that are the same (hence the matching tick marks). In the diagram, you can also see that they share a side. Since all three sides on both triangles are the same, the two triangles are congruent by the SSS theorem.
Answer: Yes they are congruent, By SSS
Step-by-step explanation:
2 sides are marked as congruent, and the 3rd side is congruent to itself by the reflexive property of equality.