To link in with our learning about Roman technology and architecture, we created our own arches out of straight pieces of wood. To do this we had to carefully create a trapezium template (nicely linking with our recent maths work on 2D shapes). We used the template to mark out our wood, then used workbenches and junior hacksaws to cut our wood out. After a bit of sanding, lots of people created some fantastic looking arches.
We discovered that the angle of the sides of the trapezium template affected the shape of the arch overall.