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Winer, Michael L.; Battista, Michael T. – International Electronic Journal of Mathematics Education, 2022
Constructing formal geometry proofs in is an important topic in the mathematics curriculum. But students' difficulties with proof are well documented. This article focuses on proofs that use triangle congruence postulates in US high school geometry. Examining students' proof reasoning in one-on-one task-based interviews, we analyzed students' oral…
Descriptors: Geometry, Mathematics Instruction, Validity, Mathematical Logic