In the graph on the right. a line segment through the center of the circie intersects the circle at the points (3,9) and (7, 11) as shown. y 3. Find the coordinates of the circle's center. b. Find the radius of the circte. c. Use your answers from parts (a) and (b) to write the standard form of the circle's equation. 0 The center is (5.5) . (Type an ordered pair.) The radius is D. (Simplify your answer. Type an exact answer, using radicals as needed.) The equation for the circle in standard form is D. (Simptity your answer.)