The second question is divided into 1 and 3. Think about it, the bisector of the angle is divided into squares. Then in two cases, you draw a picture and see that the side length of this square is 1 or 3, so the final answer is 4 or12;
The third question, drawing, can be seen that m is in the middle of AE (triangle ABE and triangle BAF are congruent), AE=5, and m is the midpoint of the hypotenuse, which is equal to 2.5.