A regular hexagon can be made from 6 equilateral triangles (all angles are 60°) where the apices of the triangles coincide at the centre of the hexagon. The corner angles of the hexagon are formed by two adjacent triangles, so the (interior) corner angles are 120°.
If the speed triangle has a movable part for measuring angles, set it to 60° and rest a piece of wood (forming one side of the hexagon) on the movable part. Rest the base of the speed square on another piece the same length as the first (forming another side of the hexagon and slide the speed square along this second piece so that the two pieces of wood touch, making a corner angle of 120°. Repeat this procedure with 4 more pieces of wood to form the hexagon from the 6 corner angles. Once assembled check the angles again in case any piece of wood has shifted. All the exterior angles should be 60° and all the sides should touch one another. If the wood is laid out on a flat surface the surface can be marked to indicate where the pieces are to fit. There should be no gaps between the sides if the measurements have been carefully made.