Question

The equation of the circle whose center is at (2, 1) and radius is 3 is (x + 2)² + (y + 1)² = 9 (x - 2)² + (y - 1)² = 9 (x - 2)² + (y - 1)² = 3

Answer 1

(x - 2)² + (y - 1)² = 9

Explanation:

The standard form equation of a circle with center (h, k) and radius r is ...

(x -h)² +(y -k)² = r²

Filling in (h, k) = (2, 1) and r = 3, you have ...

(x -2)² +(y -1)² = 9