Question

A circle is centered at (11, −9) and has a radius of 12.

What is the equation of the circle?
Enter the equation in the box using lower case variables x and y.

Answer 1

$\bf \textit{equation of a circle}\\\\ (x-{{ h}})^2+(y-{{ k}})^2={{ r}}^2 \qquad \begin{array}{lllcl} center\quad (&h,&\quad k)\qquad radius=&r\\ &11&-9&12 \end{array}$