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Quadrilateral angle sum
Polygons, solids and transformations
Essential Mathematics (Year 7)
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  Introduction
Description

So you want to know how many degrees are in a quadrilateral? Why didn't you ask?! Oh ... you were wondering why we called it the quadrilateral angle sum? Well, maths is a big fat trick! We love to use language which confuses you. I'm here to make sure that you understand that stupid language. I open the video by looking at angles in a triangle being 180 degrees and how we can use that to find the number of degrees in any polygon. Using this information we see that the angles in a quadrilateral add to 360 degrees. Using this fact we look at lots of examples which have quadrilaterals including convex and non-convex. I had so much fun! Hope you enjoyed the video.
Video tags

quadrilateral angle sum angle sum of a quadrilateral degrees in a quadrilateral degrees in a polygon quadrilaterals quadrilaterals geometry quadrilateral shapes Year 7 Maths convex angles concave angles non-convex angles awesome maths video maths made easy angles in a polygon angles in a quadrilateral angles in a quadrilateral add up to 360