VALENTINE’S DAY GEOMETRY. Irregular Polygons. Sum of the Interior Angles. Free Sample.

VALENTINE’S DAY GEOMETRY. Irregular Polygons. Sum of the Interior Angles. Free Sample.

Students are told that my beloved gave me some white chocolate hearts for Valentine’s Day but they melted in the box before I could eat them. They are presented with the solidified mess - an irregular polygon.

Students need to prove that the sum of the interior angles of the shape is (n-2)x180 where n is the number of sides.

They can find the sum by applying the formula (n-2)x180 where n is the number of sides. They can prove it by dissecting the polygon into triangles and applying the formula nx180 where n is the number of triangles created.

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

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

The full set contains a title page, worked example, 25 blank challenges and corresponding answer slides (complete with working).

What you are downloading here is the free sample.

Thank you for looking.