Based on the description you've provided about the two diagrams related to the Pythagorean theorem, the most suitable response would be:
The four yellow triangles are congruent in both large squares, and the large squares are congruent, so \(c^2 = a^2 + b^2\).
This statement correctly summarizes the reasoning behind the Pythagorean theorem, which states that in a right triangle, the area of the square on the hypotenuse (c) is equal to the sum of the areas of the squares on the other two sides (a and b). The congruence of the triangles supports the equality.