This video will teach you how to draw a regular hexagon using a compass and ruler (no protractor). In the example given you need to draw a regular hexagon of side length 4cm. So you need to draw a 6 sided shape with all of the sides exactly 4cm long. To do this open your compass to 4cm and draw a circle of radius 4cm. All you need to do know is do 6 further arcs crossing the circumference of your circle. Join these intersections up with your ruler to get your regular hexagon.