I'm definitely a math amateur, but I think I'm in your target audience. This has been really good! A topic I hear about occasionally, but never really understood. I can follow along really well. However, on one slide that says "From this triangle, we can compute the areas of the three squares we saw in the previous chapter, r^2, s^2, and t^2." I don't actually see how to find 1/4, 25/4, and 49/4." I could go way back to find that rectangle again, but perhaps you can refresh my memory, or call out more clearly on the rectangle slide the equations we'll use later to go from (3, 4, 5) to (1/4, 25/4, 49/4).