General form of the equation of a circle with its center at (-2, 1) and passing through (-4, 1)

hello:

an equation of the circle Center at the A (a, b) and ridus : r is:

(x-a) ² + (y-b) ² = r²

in this exercice : a = - 2 and b = 1 (Center at the A (-2,1))

r = AP ... P (-4, 1)

r² = (AP) ²

r² = (4+2) ² + (1-1) ² = 36

an equation of the circle that satisfies the stated conditions.

Center at A (-2,1), passing through P (-4, 1) is : (x+2) ² + (y-1) ² = 36