Question

Is the point (11, 15) on the circle defined by (x-9)² + (y-15)² = 4?
O Yes
O No

Answer 1

No don't take the points (-5,2) and (-3,-4) as the diameter of the circle, this might be a chord.

The center would always be at the perpendicular bisector of two chord or one chord and a tangent.

That's why first one is wrong and second one right.