Trigonometry Lesson 1 Episode 4 Repeating Your Reasoning No captions CaptionsStop the video above first if it is playing. No captions CaptionsStop the video above first if it is playing. Mary and Claire measure the openness of several angles using gips. Gips are a non-standard unit of measure. Eight gips fit into a full circle. Previous Episode Next Episode Home Units Trigonometry Lesson 1