The bench owns exactly two tools — Euclid's first three postulates made real: a straightedge draws the line through two points, a compass draws a circle of any centre and radius. That is all it can do.
There is no marked ruler and no protractor, and that is deliberate: either one would let you measure, and a measured point is only ever approximate. Every point here is born where two objects cross.
Sweep equal arcs from A and from B. Each crossing sits at an equal radius from both, so it is equidistant from A and B — and the line through two such points is the exact perpendicular bisector. No angle was read.
A circle's radius is exactly the side of the regular hexagon inscribed in it, which is why six equal compass steps walk right around the ring and close.
The bench slipped mid-stroke. The lesson continues without it — everything you have already constructed is safe.