Halving an angle with TGT and finding the midpoint of a circle with the Mathomat protractor

Print the two activity sheets in this investigation, and use with your Mathomat for geometric constructions.

We use the TGT in Mathomat to halve an angle, by finding its halfway point using intersecting arcs. In the second activity we find the midpoint of a circle using the circle centre finding function on the Mathomat protractor. Both of these actions using Mathomat are important geometric constructions for many different design tasks.

Accurae sketches are essential when working with mathematical proof and with detailed design work. Learning to do accurate drawings with Mathomat helps in building and reinforcing abstract mathematical ideas.

In many cases there are a number different ways to do the same geometric construction with Mathomat. Understanding these different methods helps to unlock the enormous potential in Mathomat as a design tool.