Answer:
Draw the perpendicular bisector which will be the segment joining between the point of intersection of the two arcs above AB and the point of intersection of the two arcs below AB
Explanation:
The steps to draw a perpendicular bisector are as follows:
1- Put the compass at point A and open it at a distance slightly greater than half the length of AB
2- Draw two arcs (one above the line AB and one below it)
3- With the same opening of the compass, put it on point B and draw the two arcs
4- You will note that the two arcs above the line intersected and the two arcs below the line intersected
5- Join between the two points of intersection to to create the perpendicular bisector
Since we know that Marcello finished drawing the arcs, therefore, all he has to do is join between the two points of intersection of the arcs to create the perpendicular bisector
Hope this helps :)
