Question

Which of the following is the equation of the circle with the center at the origin and r = 4?

Answer 1

Equation of circle at center at origin is given by:

\[\large \color{blue}{x^2 + y^2 = r^2}\]

Here replace r =4..

Plug in the value and find the equation..

Answer 2

\(r \) is radius here..

Answer 3

\[r ^{2} = (x-h)^{2} + (y-k)^{2}\]
where (h.k) = (0,0)