you just need to find r. You have a point on the circle, which is r units away from the center. Thus,
(3-8)^2 + (7-2)^2 = r^2
now you can easily find the area.
A circle has a center at (8, 2). The point (3, 7) is on the circle. What is the area of the circle to the nearest tenth of a square unit?
2 answers
A(-3,2),B(1,-2),(1,3)