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Koyunkaya, Melike Yigit; Kastberg, Signe; Quinlan, James; Edwards, Michael Todd; Keiser, Jane – Mathematics Teacher, 2015
Right triangles play a significant role in mathematics. In this favorite lesson, the authors help students understand variant and invariant properties by considering relationships among angle measures and side lengths in right triangles. Students explore these relationships using interactive mathematics software, changing one angle and observing…
Descriptors: Mathematics Instruction, Geometric Concepts, Computer Software, Mathematics Activities

Edwards, Michael Todd – Mathematics Teacher, 2004
Two technology-oriented activities are used successfully with entry-level geometry students during their study of symmetry. Reflection symmetry gives students opportunities to deepen their understanding of fundamental mathematical concepts like slope and symmetry, in a flexible and self-paced way.
Descriptors: Mathematical Concepts, Mathematics Instruction, Inquiry, Mathematics Activities