The length of the circle chord is x^2-2x+1+y^2-6y+9=9 passing through point (1,3) is equal to (1) 9. (2) 18. (3) 6. (4) 3.

Question

The length of the circle chord is x^2-2x+1+y^2-6y+9=9 passing through point (1,3) is equal to (1) 9. (2) 18. (3) 6. (4) 3.

Answer 1

(1, 3) is the center of the circle.

A chord that passes through the center is called the diameter.

What is the diameter of the circle?