Examples of what pupils should know and be able to do
Probing questions
How can you use the angle sum of a triangle to calculate the sum of the interior angles of any polygon?
If the polygon is regular, what else can you calculate?
What if pupils find this a barrier?
The Year 9 geometrical reasoning mini-pack - Acrobat pdf document (148Kb) includes an interesting approach to proving the sum of the interior angles of a regular polygon. See notes in phase one of the unit plan on page 8 of the booklet.
<< Previous Step | Next Step >>