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Question

Equation of a circle whose centre is origin and radius is equal to the distance between the lines x = 1 and x = -1 is
  1. x2+y2=4
  2. x2+y2=1
  3. x2+y2=4
  4. x2+y2=2


Solution

The correct option is A x2+y2=4
Radius = 2, C (0, 0)

Equation of circle can be found from this, Which will be x2+y2=4

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