Online Student Edition Student Workbooks Math in the Workplace Meet the Authors Problem-Solving Strategy Updates Scavenger Hunt Recording Sheet Chapter Resources Chapter Investigations Chapter Readiness Quiz Chapter Review Activities Chapter Test Data Updates Problem of the Week Cards Test Practice Lesson Resources Extra Examples Personal Tutor Self-Check Quizzes Concepts in Motion | Mathematics Chapter InvestigationsChapter 4: Parallels When Does a Circle Become a Line? Discover more information about Non-Euclidean Geometry online. Log InThe resource you requested requires you to enter a username and password below: | |