How do you write an equation of a circle with center (-2, 1), radius = 4? Geometry Circles Equation of a Circle 1 Answer Gerard · Stefan V. Mar 3, 2018 #(x+2)^2+(y-1)^2=16# Explanation: The standard equation of a circle with center #(a,b)# and radius #r# is given by #(x-a)^2+(y-b)^2=r^2# Then, given your problem, #[x-(-2)]^2+(y-1)^2=4^2# Answer link Related questions How do you write the general form given a circle that passes through the given points. P(-2, 0),... What is the equation of the circle with a center at #(7 ,1 )# and a radius of #2 #? What is the equation of the circle with a center at #(3 ,1 )# and a radius of #2 #? What is the equation of the circle with a center at #(3 ,1 )# and a radius of #1 #? What is the equation of the circle with a center at #(3 ,5 )# and a radius of #1 #? What is the equation of the circle with a center at #(3 ,5 )# and a radius of #6 #? What is the equation of the circle with a center at #(2 ,5 )# and a radius of #6 #? What is the equation of the circle with a center at #(2 ,2 )# and a radius of #4 #? What is the equation of the circle with a center at #(2 ,2 )# and a radius of #3 #? What is the equation of the circle with a center at #(2 ,1 )# and a radius of #3 #? See all questions in Equation of a Circle Impact of this question 4648 views around the world You can reuse this answer Creative Commons License