Line of text in the book seems to be wrong on page 63.

[jimk1955]

Hello,

Your book is excellent, Thank You for writing it.
Books like yours have been my source of education for web development.

I just noticed a small thing on page 63 of the pdf file and thought I would bring it to your attention.

"Breaking that down, you get 36 + 64, or 100 = dist**2.

With some basic algebra, you can reduce that to .100 = dist.
/* I believe this sentence should be omitted */

And from that, you can easily figure out that the distance between the two objects is 10."

Thank You again for your work.

Jim