We're matching the visual angle with the corresponding angle measure. Great practice. See if you do it on your own before listening to Sal!
Benchmark angles is a free educational video by Khan Academy.It helps students in grades 4 practice the following standards 4.MD.C.5.
1. 4.MD.C.5 : Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement..
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