2.1 Circles (Part 2) – Paul Nguyen

Supplemental Videos

We then derived the equation of a circle with center (h,k) and radius r.

$(x-h)^2+(y-k)^2=r^2$

We can use this to create equations of circles.

Sometimes we’re given the equation of a circle not in standard form, so we have to put it in that form by completing the square. Twice.

Here are some practice problems for circles.