A simple circle question

  • Thread starter soggybread
  • Start date
  • #1
20
0
Hi guys,

I found this little problem on some website ages go, and was just wondering what you think of it:

http://img354.imageshack.us/img354/9052/cirlce8hk.gif [Broken]

Anyone have any ideas?
 
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Answers and Replies

  • #2
AKG
Science Advisor
Homework Helper
2,565
4
|OA| = R (since OA is a radius of the big circle)
|OA| = |OM| + |MA| (just look at it)
|MA| = r (since AM is a radius of the small circle)
r² + r² = |OM|² (pythagorean theorem)
 
  • #3
20
0
interesting, i was thinking that: Line OM + r = R

would that work?
 
  • #4
81
0
That's what you get when you put AKG's first three lines together into a single equation. Now put that together with the fourth line, and you've got it
 

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