Investigating 10th grade students' understanding of the structure of deductive proof

Miyazaki, Fujita, and Jones define the structure of deductive proofs as the relational network via deductive reasoning that combines singular and universal propositions. Related to the theory, this research aims to investigate students understanding of the structure of deductive proofs. Researchers conducted a qualitative research to 30 students of 10th grade. The data was collected from geometrical proof test that focused on Sine and Cosine rule. The result of this research showing the lack of students understanding of the structure of deductive proofs. For the future research, researchers wonder whether to apply a flow-chart proof or a table proof to teach mathematical proving can improve students understanding of the structure of deductive proofs.