On page 85, the second formula is wrong. It should say that the area equals pi times r squared times theta divided by 360. Thanks to a kind reader for pointing out this error. I have created a short video explaining how to derive this formula. To see it, please click or tap here. On page 346, Final Exam Question 20 contains an error that makes none of the choices correct. All of the choices should say "square meters," not "meters." Then the correct answer emerges as choice A. For explanations of the answers to all 100 exam questions in this book, you can watch several hours' worth of videos on a YouTube playlist. Enjoy! Last updated on December 12, 2013. |