a polygon is a shape with three or more straight sides.

Key Skills

  • know the names of the commonly used polygons.
  • calculate the sizes of interior and exterior angles of regular polygons.
  • know and use the general formula for finding the sum of the interior and exterior angles of polygons.


polygon, convex polygonconcave polygon, regular polygon, exterior angle, interior angle, equilateral trianglesquare,pentagonhexagonoctagondecagon.