Answer:
HL
Explanation:
The diagram depicts two right triangles that share one leg and have congruent hypotenuses, as indicated by the tick marks.
According to the Hypotenuse-Leg Triangle Congruence Theorem (HL), if the hypotenuse and one leg of a right triangle are congruent to the corresponding parts of another right triangle, then the two triangles are congruent.
Therefore, we can immediately conclude that the triangles are congruent by the HL congruence theorem.