How do you write the equation of the circle with center (-1,3) and radius 3?
1 Answer
Oct 8, 2016
Explanation:
The standard form of the equation of a circle is.
#color(red)(bar(ul(|color(white)(a/a)color(black)((x-a)^2+(y-b)^2=r^2)color(white)(a/a)|)))#
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.
#(x-(-1))^2+(y-3)^2=3^2#
#rArr(x+1)^2+(y-3)^2=9" is the equation of the circle"#
