JEE Main 202126 Aug, Evening shiftMathematicsMediumCoordinate Geometry478× since 2002
A circle C touches the line x = 2y at the point (2, 1) and intersects the circle
C₁ : x² + y² + 2y 5 = 0 at two points P and Q such that PQ is a diameter of C₁. Then the diameter of C is :