1. Draw the base AF of length 2.5cm
2. From A as well as F, draw arcs of length 2.5cm intersecting at O.
3. Move the compass at O and draw a full circle with the same measurement.
4. With the compass at A, draw an arc cutting the circle creating the next vertex at B.
5. Now move the compass at B and cut an arc on the circle creating the vertex C.
6. Continue doing so, till the hexagon is formed.