It just allows to get the intersection point of a circle with a straight line.

The dry compass is traditionnaly used to transport distances,
and doesn't usually allow this construction. Here we do. It is a 'marginal' usage of the dry compass.

With an (unmarked) straightedge and this dry compass, construct :

- A square with given side AB Solution
- Midpoint of a given segment AB Solution
- An equilateral triangle with given side AB Solution
- Two circles are defined by their given centers and radii.

We are unable to draw them, but construct their intersect points ? Solution

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