Question

how are the triangles congruent?

Explanation:

Step1: Recall congruence criteria

The SAS (Side - Angle - Side) criterion states that if two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, the triangles are congruent.

Step2: Analyze the given figure

From the markings (the two sides and the included angle), we can see that the SAS criterion is applicable.

Answer:

SAS