15) geoff has been given three points a, b, and c that are not on a line and he is trying to construct a circle that passes through all of the three points. so far he has created two line segments, ab and bc and found the perpendicular bisector of both segments. what step should he do next? a. construct the intersection point of the two perpendicular bisectors. b. construct the perpendicular bisector of ab. c. construct the circle using the intersection point of the perpendicular bisectors as the center and the length of ab as the radius. d. construct the circle using the length of bcas the diameter.