Question

Write the standard form of the equation of the circle with the given center and radius.


1. center (-2, 0) and r = 3

Answer 1

The standard form equation of a circle:

( x - h ) ^ 2 + ( y - k ) ^ 2 = r ^ 2

h are the x coordinate of the center of the circle.

k are the y coordinate of the center of the circle.

r = radius


In this case:

h = - 2

k = 0

r = 3


So equation of a circle :

( x + 2 ) ^ 2 + y ^ 2 = 9