DIAGNOSTIC PROBLEM SOLVING IN GEOMETRY AS A TOOL FOR DIAGNOSING STUDENT DIFFICULTIES.

We propose a successful diagnostic tool that will assist teachers in uncovering their students difficulties in solving geometry problems by incorporating diagnostic problems into mathematics instruction. Through the diagnostic problems, the teacher can quickly and accurately diagnose the specific knowledge gaps of a student so that the student can fill these gaps and progress successfully in learning the material in the mathematics curriculum. Using this tool, the teacher will be able to identify the material that needs to be reviewed, clarified, or reinforced, as well as the material that has been well-learned and mastered by the students.