Give a definition for radius of a circle. Are there other terms that need to be defined first? What are they, and how might you define them?

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#### Solution

__Radius of a circle__ :-

It is the distance between the centres of a circle to any point lying on the circle.

To define the radius of a circle, we must know about point and circle.

Concept: Euclid’S Definitions, Axioms and Postulates

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