JEE Main 2019 Mathematics question
Two circles with equal radii are intersecting at the points (0, 1) and (0, −1). The tangent at the point (0, 1) to one of the circles passes through the centre of the other circle. Then the distance between the centres of these circles is:
Answer: (C)
Solution
Centres (±h, 0); radii to (0, 1) perpendicular ⇒ h = 1; distance 2.