How to construct a heptagon, a regular 7-sided polygon?|
As stated in the constructions page, a heptagon can not be constructed by (strict) ruler-and-compass rule. The practical way to do it is using the coordinates of the angular points and draw it as accurately as needed.|
Here are the coordinates, for the orientation as shown:
|For different orientations, manipulate x- and y-values, as follows:|
The given coordinate values assume a circumscribed circle with radius 1.0000. For heptagons of different sizes, multiply all x- and y-values with the desired radius of the circumscribed circle.
- for a heptagon pointing to the left, exchange + and – of all values
- for a heptagon pointing up, exchange x- and y-values
- for a heptagon pointing down, do both, exchange + and –, and exchange x- and y-values