The intersection of the circle of Diagram 10 and the circle of Diagram 12 functions as the centre of a small circle, which is shown in Diagram 16.

The outside of this little circle crosses the intersection of the outside of the Tawsmead Copse formation and the seven-fold star of Diagram 15.

The same little circle crosses the seven-fold star of Diagram 14.

Together with the intersections of Diagrams 17 and 18, the centre of the circle forms two lines which have - by definition - the same length.

This is shown in Diagram 18.

The same intersections form the centres of two new little circles, which are identical to the circle of Diagram 16.

One of the circles crosses - among other things - the outside of the Tawsmead Copse formation.

The other circle crosses - among other things - the seven-fold star of Diagram 14.

Because of this, two more lines are created, as shown in Diagram 20.

These have - by definition - the same length as the first two lines.

We now have four small lines with the same length.

On the right side of the formation, we can repeat constructing these lines.