Multiple choice

If two circles of same radius cut each other so that each passes through the centre of other then the distance between their centres is equal to -

  1. their radius

  2. their diameter

  3. length of the tangent

  4. twice their diameter

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A Correct answer
Explanation

When two circles of equal radius intersect such that each passes through the other's center, the distance between centers equals the radius. All three sides (two radii and distance) form an equilateral triangle.