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Nirode, Wayne – Mathematics Teacher, 2017
Since the 1970s, the Mathematical Association of America's (MAA) journals "Mathematics Magazine" and "College Mathematics Journal" have published "Proofs without Words" (PWWs) (Nelsen 1993). "PWWs are pictures or diagrams that help the reader see why a particular mathematical statement may be true and how one…
Descriptors: Mathematics Instruction, Mathematical Logic, Validity, Secondary School Mathematics
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Nirode, Wayne – Mathematics Teacher, 2016
A part of high school geometry is devoted to the study of parallelograms in the context of proving some of their properties using congruent triangles (CCSSI 2010). The typical high school geometry book's chapter on quadrilaterals focuses on parallelograms (e.g., their properties, proving that a given quadrilateral is a parallelogram, and special…
Descriptors: Geometry, Geometric Concepts, Mathematics, Mathematics Instruction
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Nirode, Wayne – Mathematics Teacher, 2015
When students work with a non-Euclidean distance formula, geometric objects such as circles and segment bisectors can look very different from their Euclidean counterparts. Students and even teachers can experience the thrill of creative discovery when investigating these differences among geometric worlds. In this article, the author describes a…
Descriptors: Mathematics Education, Geometric Concepts, High School Students, Secondary School Mathematics