Errors and Misconceptions in Euclidean Geometry Problem Solving Questions: The Case of Grade 12 Learners

Euclidean geometry provides an opportunity for learners to learn argumentation and develop inductive deductive reasoning. Despite the significance of developing these skills, learner performance in mathematics, particularly geometry, remains a concern many countries. Thus, current study examined nature learners’ errors problem-solving, regarding theorem angle at centre its applications. Van Heile’s theory geometric thinking teacher knowledge error analysis were used as conceptual frameworks make sense misconceptions. Using participatory action research approach, was operationalised by five mathematics teachers from four secondary schools Motheo district Free State Province South Africa three academics two local universities. The analysed 50 sampled midyear examination scripts Grade 12 schools. findings this revealed that most resulted concepts on operating Levels 0 1, while questions mainly required Level 3 thinking. recommends determine their level integrate lesson preparations material development.