Question

Which of the following is the equation of a circle whose center is at the origin and whose radius is sqrt 5?

x^2 + y^2 = 5
x^2 + y^2 = 10
x^2 + y^2 = 25

Answer 1

\[\huge\rm (x-h)^2 + (y-k)^2 = r^2\]
standard form of circle
where (h,k) is the order pair
and r is the radius

Answer 2

thank you!