Question

If P = (-2, -1) and Q = (2, 1) are the

endpoints of the diameter of a circle
find the equation of the circle.
(x − [?])² + (y - [ ])² = []

Answer 1

r = √(2² + 1²) = √(4 + 1) = √5

The equation of the circle is:

(x - 0)² + (y - 0)² = 5

x² + y² = 5