It's very, very easy. You will need a compass, a pen and/or pencil, and a ruler to make measurements and draw straight lines.
- With the compass, draw a circle with the same radius as you want the length of the sides.
- With the ruler, draw a line exactly bisecting the circle by going through the hole the compass made in the centre.
- Draw two more circles with the compass, this time centring it at the points where the line bisects the circle.
- With the ruler, connect the points where the three circles overlap.
And that's it. You have a perfect hexagon drawn to precise measurements.
If you need to draw a hexagon with measurements from side to side, you will need these ratios:
The circle will need to be 1.154 x the desired width of the hexagon, which means that the hexagon will be 0.86 x the diameter of the circle.
There you go. Easy-peasy.