If both of the two legs are the same length, the distance between the two endpoints of each line (leg) must be the same distance. This means that the hypotenuse MUST be the same length. Using SSS, since all 3 sides must be the same length, the triangles are congruent.
348:3072 because you multiply all the original number and then you get 348 and then you double the original number and multiply the doubled number and you get 3072,