The next step that Ian needs in bisecting the line segment CD is; keep the compass the same width, and place it on the other point D.
Bisecting a line segment simply means we are trying to divide the line segment into two equal parts. The steps to use to bisect a line segment is as follows;
Step 1: Place a compass at the center of line CD and make an arc at both ends of line CD.
Step 2: Place the compass at each of the arcs you made at both ends of CD and make a mark above and below line CD.
Step 3: Join the points of intersection of both arcs above and both arcs below line AB. That is the perpendicular bisector of line AB.
Looking at Ians' procedure, his last step was what is step 1 of the above i have listed and as such his next step would be to keep the compass the same width, and place it on the other point D.
Read more about bisecting Line segment at; https://brainly.com/question/28626827
#SPJ1