Construct a regular hexagon of side $4.3$ cm and construct a circle circumscribing the hexagon.
- Construct a regular hexagon $ABCDEF$ with each side equal to $4.3$ cm.
- Draw the perpendicular bisectors of sides $AB$ and $BC$ which intersect each other at point $O$.
- With $O$ as center and $OA$ as radius, draw a circle passing through all the vertices of the regular hexagon $ABCDEF$.
The circle so obtained is the required circle circumscribing the given regular hexagon.