VALENTINE’S DAY GEOMETRY. Regular and Irregular Polygons. Interior and Exterior Angles.

A selection of Valentine’s Day themed resources to help students in the development of their understanding of interior/exterior angles in relation to both regular and irregular polygons.

Full descriptions can be found under the heading of each individual resource.

Key ideas:-

The sum of the interior angles of a polygon is (n-2)x180 where n is the number of sides.

The sum of the interior angles of a polygons is nx180 where n is the number of triangles within the polygon.

The sum of the exterior angles of a polygon is 360.

The size of one exterior angle of a regular polygon is 360 divided by the number of sides.

The number of sides of a regular polygon can be found by dividing 360 by one exterior angle.

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