Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle. Recognising line symmetry and rotational symmetry will also help.

1 School of Physiotherapy, Curtin University, Bentley, WA 6102, Australia 2 Curtin University, Bentley, WA 6102, Australia Correspondence to: Dr Hopper School of Physiotherapy, Curtin University, ...