Amazon.com: Trigonometry: A Complete and Concrete Approach (9780070194199): Harold S. Engelsohn: Books. I am curious so I am reading this book. I like it. If you love Geometry which I do, you will enjoy this book. He brings up many of the theories of plane geometry in the first chapter. I couldn’t put it down. I plan to read one chapter every other day. It is pretty straightforward to understand if you have taken geometry.

I’ve been watching math videos on Khan Academy and I think Sal’s math enthusiasm is starting to rub off on me. I saw a sign for a club that said 50/50 and I thought, well that simplifies to one. I don’t believe I would have given it a second thought before. Has anyone had a spontaneous math thought?