Pythagoras Theorem

You see here four congruent right-angled triangles with sides a, b and hypotenuse c.
1. What is the area of the square built by these four triangles (including the small square in the middle)? Make a sketch of the situation and write down your solution on paper. 2. Now drag the blue point counter-clockwise as far as possible. What is the area of the small red and the big blue square? Again, make a sketch of the situation and write down your solutions on paper. 3. Do you see any connection between the areas in task (1) and (2)? Write down your conjectures.