**POLYONS**

- Key ideas
- Naming polygons (up to 10 sides)
- Revisited the formula and how to derive them, as well as the relationship:
- Sum of interior angles of a polygon = (n - 2) x 180º (using a pentagon to help us visualise)
- Sum of exterior angles of a polygon is always 360º (using an equilateral triangle and square to help us visualise)
- Interior angle + Exterior angle = 180º
- When one increases, the other decreases
- How to deal with polygons of unusual shapes

- Discussion (1) with the following papers:
- HIHS 2017 S2 Mid-Year Exam Paper 2 Q9
- CGS 2015 S2 Mid-Year Exam Section B Q3
- FMS 2015 S1 EOY Exam Paper 1 Q11
- NYGHS 2015 S1 EOY Exam Paper 2 Q5

- Discussion (2) with handout WJEC CBAC GCSE papers

Solution presented by Corwin

- Note that, when the context is defined here, that we know that n must be an integer (since it represents the number of sides of a polygon), we may leave out defining n is an integer. However, when without context, we should define n when constructing the inequality. (with inputs with Ethan)

**Next week (T4W3)**, we will move into the following topics:

- Mensuration (Perimeter, Area, Volume), which involves simple algebra
- Linear Graphs, Sketching
- Algebra
- Construction will be kept to the last week of the revision

Do attempt the other schools' exam papers to prepare for the upcoming topics.

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