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Internal and External Angles of Polygons
Angle Properties of Polygons are illustrated here. The formulae for the sum of internal angles and external angles of n - sided polygons (up to n =20) is shown in the applet Angle Properties of Polygons
The file is downloadable at regularpolygon3to20_int_extangles.ggb
Feel free to modify it. I welcome feedback at lewweisern@gmail.com
