How do you find the equation of the circle given center (-7,5) and radius=9?
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 = -7 , b = 5 and r = 9
#rArr(x+7)^2+(y-5)^2=81" is the equation of the circle"#