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?

Answer 1

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.

Answer 2

A(-3,2),B(1,-2),(1,3)