Interior and Exterior Angles of Polygons

Interview lesson which was originally 30 minutes but I have since adapted the lesson to last the whole hour.


Goes through step by step to try and get pupils to discover the 180*(n-2) formula for total angles in a polygon by splitting in to triangles, with irregular shapes for the pupils to draw on.

Answers for worksheets are provided, which print A5 both sided if you print two per page and flip on short edge!