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Question
Describe the locus of the centre of a given circle which rolls around the outside of a second circle and is always touching it.
Diagram
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Solution
The locus is the circumference of the circle concentric with the second circle whose radius is equal to the sum of the radii of the two given circles.
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Chapter 16: Loci (Locus and Its Constructions) - Exercise 16 (B) [Page 241]
