Question

how are the triangles congruent?

Explanation:

Step1: Analyze the given information

We have two right - angled triangles (as there is a right - angle symbol). The hypotenuse (the side opposite the right - angle) is marked as equal (by the same marking), and the leg (one of the non - hypotenuse sides) is also marked as equal.

Step2: Recall the congruence criteria

The HL (Hypotenuse - Leg) congruence criterion states that if the hypotenuse and a leg of one right - triangle are equal to the hypotenuse and a leg of another right - triangle, then the two right - triangles are congruent.

Answer:

HL (Hypotenuse - Leg)