Incorporate simple and complex figures, distortion and proportion, and visual reasoning into your discussion of similarity.
Dana C. Cox and Jane-Jane Lo
Dana C. Cox and Michael Todd Edwards
How do middle school students interpret the phrase “two sizes too small”? Examining students' responses will re-form your thinking about teaching similarity and using nonstandard shapes.
Suzanne R. Harper and Dana C. Cox
Emphasizing the process rather than the produced solution, the Kaleidoscope task inspires students to create an artifact for further reflection and discussion.
Michael Todd Edwards, Suzanne R. Harper and Dana C. Cox
The Meeting for Lunch problem exemplifies how standards provide more than an outline of daily activities for an entire school year.
Michael Todd Edwards, James Quinlan, Suzanne R. Harper, Dana C. Cox and Steve Phelps
This approach to determining measures of angles fosters stronger understanding of formal proof.