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Circles around Circles (Posted on 2007-12-23) Difficulty: 3 of 5
Three circles (A, B, and C) are tangentially connected:

Properties:
1) Circle B's radius is twice the radius of Circle A.
2) Circle C is of the exact size that if it rolls around A, or it rolls around B, it will touch A and B on the opposite side at identical points E and F.

What is the radius of Circle C if:
1) C > B
2) B > C > A
3) A > C (C is a maximum)

No Solution Yet Submitted by Leming    
Rating: 3.7500 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Puzzle Answer Comment 4 of 4 |
For part 1, the required radius of the circle ~ 2.528338144005302.
For part 2,  the required radius of the circle =~1.277055977365758 relative to the radius of A
For part 3, the required radius of  C  ~ 8588623104214621 for C. This is the largest that is less than 1 (i.e., less than the radius of circle A).

Edited on April 9, 2024, 3:51 pm
  Posted by K Sengupta on 2024-04-09 15:44:43

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