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Question

What is the condition for two concentric circles of radii r1 and r2 to be congruent ?
  1. r1r2 = 1
  2. r1r2 > 1
  3. r1r2 < 1
  4. r2r1 > 1


Solution

The correct option is A r1r2 = 1
Circles having same centre are known as concentric circles. For two circles to be congruent, they must overlap each other i.e their radii must be equal.
So, r1=r2
 r1r2 = 1

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