Experiment with the sliders to change the width and height of this right-angled triangle.
Watch what happens to the areas of the squares.
What do you notice?
How might that let you predict the length of the longest side c (the hypotenuse) from the width a and height b ?

If you set the width to 8 and height to 6, what will the three square areas be?
So what length will the hypotenuse c be in this triangle?
The sliders won't allow it, but suppose I could set a width a = 12 and height b = 5. What would the hypotenuse c be now? Why?
What if I set a = 7 and b = 24?
Can you write a general rule about how c is connected to a and b?
Can you write that rule in algebra?