When constructing perpendicular lines with a compass and straightedge, how should you start the construction

Question

anonymous · Answer

Draw a line and choose a point of intersection so that you have enough information to construct the second line.

campbell_st · Answer

put a pencil in the compass... 

draw a line segment with the straight edge

open the compass to more than half the length of the interval

put the compass point at one end of the line segment

draw an arc above and below the line. 

thats the start...