VALENTINE'S DAY GEOMETRY. Finding the Sum of the Interior Angles of an Irregular Polygon. Sample.

**VALENTINE’S DAY GEOMETRY. Finding the Sum of the Interior Angles of an Irregular Polygon. Free Sample **

Students are presented with the outline of an animal who has lost his mate. They are told that the sum of the interior angles of animal in front of them is exactly the same as the lost mate.

Students are asked to work out the sum of the interior angles of the animal in front of them and then multiply to find the sum total of the interior angles of both animals.

Students can work out the interior angles of the animal in front of them by:-

1. Counting the number of sides and then applying the formula (n-2)x180

or…

1. Dissecting the shape into triangles and then multiplying the number of triangles by 180.

The combined total of the interior angles of both animals is found by simply multiplying the interior angles of the first animal by 2.

This is a PowerPoint document so it can be easily displayed on the board and/or printed for students to complete by hand.

The free sample contains a title page, one worked example, a blank challenge and corresponding answer slide (complete with working).

The full set contains contains a title page, one worked example, ten blank challenges and corresponding answer slides (complete with working).

What you are downloading here is the free sample.

Thank you for looking.