29.10.11

Angle sum of a polygon

Why is the formula for angle sum property of a polygon (n-2) x 180? This is what the students investigated by cutting a set of different polygons into triangles and arriving at a conclusion with their group! They had a clear task sheet for the work. They hummed, sang and chatted their way to the discovery. Even the most disinterested in Maths joined in --- eventually. 
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