Our proof in Chapter 1 has been by visual inspection and consideration of various arrangements of eight triangular playing pieces. I can imagine our mathematically minded ancestors doing much the same thing some three to four thousand years ago when this theorem was first discovered and utilized in a mostly pre-algebraic world. To conclude this chapter, we need to address one loose end. Suppose we have a non-right triangle. Does the Pythagorean Theorem still hold? The answer is resounding no, but we will hold off proving what is known of the A + B = C³ =a+ß = y , until Chapter 2. However, we will close Chapter 1 by visually exploring two extreme cases where non-right angles definitely imply that A² + B² * C? . the Pythagorean Theorem, converse as