Above, a line cuts across two adjacent rectangles.

How many right triangles can you find in this diagram?

In the diagram below, two chords that are diameters of a circle intersect at right angles. What is the area of the circle?

**Pythagorean Theorem Proof #1**

In both diagrams below, the right triangles have a short leg length of \(a\) and a long leg length of \(b.\) If the area of the figure on the right is \(4\left(\frac{1}{2}ab\right) + c^2,\) which expression could represent the area of the figure on the left?

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