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| Math Central | Quandaries & Queries |
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three circular rings of equal radii of 1cm each are touching each other. a string runs all around the set of rings very tightly. what is the minimum length of string required to bind all the three rings ? |
Seema,
Again, add relevant points and straight lines to a neat diagram. It may help to remember that a tangent line to a circle (one that touches it at just one point P) always makes a right angle with the radius to P form the center of the circle; and if two circles touch, the line joining their centers also passes through the point at which they touch.
Good hunting!
-RD
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