Question

Suppose we wish to construct the perpendicular bisector of line segment EF. We can correctly begin by placing the compass point on E and marking off the distance to point

Answer 1

The answer is marking of the distence to point A

Answer 2

- to a point which is more than halfway to the point F. Then draw an arc  around the point. Next place the compass point at  F and,  keeping the same distance between the points of the compass,  draw another arc so as to intersect the first arc at 2 points above and below the line EF. Finally draw a line passing through these 2 points of intersection.  This is the perpendicular bisector of EF.