OG Blue Book Math Page 398 #11

fabxx
Thu, 13 Nov 2008 22:16:22 +0000

There’s a graph to this question. Can also help me out? I don’t get why its 18pi, shouldn’t it be 36pi?

C=36pi, and C=2rpi so therefore r=18. It’s asking for the length of the curved path from A to B right? The curved path from A to B equals AO+OB, so it should be r+r=36pi. Why is it 18pi?

Thanks in advance. (You’ll need to see the graph on the book to get what i’m saying)