In order to calculate the Area of a circle you need the radius. The radius of a circle is the distance from the center (which we know) and one of the many points on the circle, one of which we were given.
Use the distance formula to calculate the radius:
where and are the coordinates of the given points.
Stop short of taking the indicated square root because you are going to need the radius squared to find the area anyway. Just drop a next to the number you calculate for the radicand and you are done.
John
My calculator said it, I believe it, that settles it
