Octagon divided into 6 parts

Geometry Level 2

A father died and left his 6 sons an octagon field with 8 equal side lengths but different angles, as shown in the figure below.

The 6 sons want to divide the field up into 6 congruent parts, but do not care about the position or orientation.

Using only a ruler, can we divide the field into 6 identical parts?

Source: French Mathematical Olympiad 1988.

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