This approach to determining measures of angles fosters stronger understanding of formal proof.
Michael Todd Edwards, firstname.lastname@example.org, Suzanne R. Harper, email@example.com, and Dana C. Cox, firstname.lastname@example.org, teach prospective mathematics teachers at Miami University in Oxford, Ohio. James Quinlan, email@example.com, is an assistant professor of mathematics at the University of New England in Biddeford and Portland, Maine. Steve Phelps, firstname.lastname@example.org, teaches students at Madeira High School in Madeira, Ohio. All share professional interests regarding the use of technology in the teaching and learning of school mathematics, with particular emphasis on dynamic geometry software.