- Pupils draw a variety of shapes using the software, displaying the internal angles and the sum of the internal angles.
- They then explore the effect of moving vertices, allowing individual angles to be changed.
- Teachers invite pupils to offer observations and conjectures about the sum of the internal angles of different polygons.
- The effect on the sum of moving from a convex to a concave polygon can also be explored.

Objectives:

- Generate terms of a linear sequence using term to term and position to term rules using ICT

- Explain how to find calculate and use:

• The sum of the interior angles of triangles, quadrilaterals, pentagons and hexagons

• The interior angles of polygons

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