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These are the Transum resources related to the statement: "Pupils should be taught to derive and use the sum of angles in a triangle and use it to deduce the angle sum in any polygon, and to derive properties of regular polygons".

Here are some specific activities, investigations or visual aids we have picked out. Click anywhere in the grey area to access the resource.

- Angle Chase Find all of the angles on the geometrical diagrams.
- Angle Theorems Diagrams of the angle theorems with interactive examples.
- Angles in a Triangle A self marking exercise involving calculating the unknown angle in a triangle.
- Polybragging The Transum version of the Top Trumps game played online with the properties of polygons.
- Polygon Angles A mixture of problems related to calculating the interior and exterior angles of polygons.
- Polygon Angles Animation Barbara Bug walks around a regular hexagon turning through each of the exterior angles as she goes.

Here are some exam-style questions on this statement:

- "
*The exterior angle of a regular polygon is 72°*" ... more - "
*A number of regular pentagons and squares are arranged around the outside of a large blue regular polygon. Just the lower part of the arrangement is shown below.*" ... more - "
*PQRS is a rhombus and C is the midpoint of QS.*" ... more - "
*The diagrams are not drawn to scale*" ... more

Click on a topic below for suggested lesson Starters, resources and activities from Transum.

How do you teach this topic? Do you have any tips or suggestions for other teachers? It is always useful to receive feedback and helps make these free resources even more useful for Maths teachers anywhere in the world. Click here to enter your comments.