Question

The circle below is centered at the point (2, -1) and has a radius of length 3. what is its equation

Answer 1

(x - 2)² + (y + 1)² = 9

Explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

here (h, k) = (2, - 1) and r = 3

(x - 2)² + (y - (- 1))² = 3²

(x - 2)² + (y + 1)² = 9 ← equation of circle