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Monday, October 14 • 12:30pm - 1:15pm
Triangle Congruence Theorems: Developing Reasoning Through Informal Arguments

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This session will include the description of an activity used to introduce triangle congruence theorems in a high school geometry course. The purpose of this activity is to develop students’ reasoning and justification through informal arguments prior to writing proofs using triangle congruence theorems. Participants will discuss the number of elements needed to prove two triangles congruent. Participants will then be assigned a possible triangle congruence theorem. Group discussion will follow, including arguments formulated by participants, as well as student examples from high school geometry students. The session will conclude with a summary of the activity and its use for implementation in a high school geometry course.

Speakers
avatar for Brooke Krejci

Brooke Krejci

Aplington Parkersburg High School
I am in my sixth year of teaching, and I have taught grades 7-12. I am wrapping up my EdD in Curriculum and Instruction with an emphasis in Mathematics Education. I just finished my research on preservice teachers' mathematics teaching efficacy. I currently teach general math, pre-algebra... Read More →


Monday October 14, 2019 12:30pm - 1:15pm
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