Open the compass it is more than half of the distance between a and b, and scribes arcs of the same radius centered at a and b. call the two points where these two arcs meet c and d. Draw the line between c and d. CD it is the perpendicular bisector of the line segment AB. call the point where CD intersects AB and E
First: place the compass on the end of a line segment. second: adjust the compass to just slightly longer than half the line segment length. third: draw arcs above and below the line fourth: keeping the same compass width draw arcs from the other end of the line. last place ruler where arcs cross and draw line segment
