Sum of Angles in 4 Sided Polygon: Proof (DTube)mes (67)in #dtube • 5 years ago (edited)View this post on Hive: Sum of Angles in 4 Sided Polygon: Proof (DTube)
I don't always sum up the angles in a quadrilateral but when I do the answer usually comes to equal 360 degrees ;)
View Video Notes on Steemit: https://steemit.com/mathematics/@mes/sum-of-angles-in-4-sided-polygon-proof