Answer:
29
Explanation:
Because all the triangles have the same length for the top part, we just need to find one of them.
The Pythagorean theorem says to do a squared + b square = c squared. So 2 squared is 4, and 5 squared is 25. 25 + 4 = 29.
Because the next step requires us to find out the root of 29, but then we need to square it again, that leaves us with 29.
Hope that helped in some way or another.