How do you write the equation of the circle with center (-1,3) and radius 3?
The standard form of the equation of a circle is.
where (a ,b) are the coordinates of the centre and r, the radius.
here a = -1 , b = 3 and r = 3
substitute values into the standard equation.
#rArr(x+1)^2+(y-3)^2=9" is the equation of the circle"#