6.1 Video: Perpendicular Bisectors (11:23)
6.1 Video Angle Bisectors (14:56)
6.2 Video Circumcenter/Incenter (9:52)
6.2 Video Circumcenter/Incenter (9:08)
6.3 Video Medians (15:45)
6.4 Video Midsegments (11:58)
6.5 Video Triangle Inequalities (13:09)
6.6 Video: Hinge Theorem (9:02)