When constructing an angle bisector, the compass must be used to make three arcs. do all three arcs need to have the same radius? explain. a. yes, because you need the points of intersection of the angle and arcs to form a parallelogram. b. yes, because then the marks are equidistant from each other. c. no; any three radii will work. d. no; the second two arcs must have the same radius but it can be different from the first.