angles, geometry Exterior Angles of a Polygon and other shapes February 20, 2017 mhorley Leave a comment I find some students like to memorise this, or at least the first two or three rows and then remember that we keep adding 180 for extra size. Reason being – an extra triangle. I feel that using exterior angles is more satisfying. I find myself walking around an imaginary hexagon in my classroom with arm out stretched. Here is a very nice Geogebra visualisation of this: Exterior Angle Collections: REVAMPED! Modify at https://t.co/zXdRkaQEym @geogebra @panlepan @solvemymaths @giohio @gogeometry @NCTM #MTBoS pic.twitter.com/1dgxkNwhgh — Tim Brzezinski (@dynamic_math) July 16, 2017 And here’s an activity which reinforces this idea. Use a pencil as an arrow. Does it always rotate through 360? Does it always turn the same direction? Use algebra, maybe? Advertisements Share this:TwitterFacebookGoogleLike this:Like Loading... Related