Addressing Misconceptions in Secondary Geometry Proof

Michelle Cirillo
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Jenifer Hummer
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Use these ideas to diagnose and address common conceptual obstacles that inhibit students' success.

Contributor Notes

Michelle Cirillo,, is a former secondary mathematics teacher who now works in the Department of Mathematical Sciences at the University of Delaware preparing secondary teachers and partnering with classroom teachers on research projects that make progress on problems of practice.

Jenifer Hummer,, is a former educational administrator and high school mathematics teacher in New York City who is currently pursuing a Ph.D. at the University of Delaware. She is interested in supporting secondary mathematics teachers through research-based professional development.

(Corresponding author is Cirillo
(Corresponding author is Hummer
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