What is the standard equation of a circle with center #(-2, 0)# and radius #4#?
1 Answer
Jun 23, 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 = -2 , b = 0 and r = 4
Substitute these values into the standard equation.
#(x-(-2))^2+(y-0)^2=4^2#
#rArr(x+2)^2+y^2=16" is the equation of the circle"#
