To determine whether the two right triangles are congruent, Malik can use the concept of HL (Hypotenuse-Leg) congruence. Since both triangles have a hypotenuse of 13 units, and he knows one leg of each triangle (12 units for the first triangle and 5 units for the second triangle), he can apply the HL theorem, which states that if the hypotenuse and one leg of a right triangle are equal to the hypotenuse and one leg of another right triangle, then the two triangles are congruent.
Therefore, the appropriate response is:
He could apply the concept of HL and show that the two triangles are congruent.