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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.

- Angles in a Triangle Video A reminder of how to use the fact that the angles in a triangle sum to 180 degrees to find the size of unmarked angles in triangular diagrams.
- Angles in a Triangle A self marking exercise involving calculating the unknown angle in a triangle.
- Angle Chase Find all of the angles on the geometrical diagrams.
- Angle Theorems Diagrams of the angle theorems with interactive examples.
- Polygon Angles Animation Barbara Bug walks around a regular hexagon turning through each of the exterior angles as she goes.
- Polygon Angles Video A concise reminder about angles, both interior and exterior, in regular and irregular polygons.
- Polygon Angles A mixture of problems related to calculating the interior and exterior angles of polygons.
- Polybragging The Transum version of the Top Trumps game played online with the properties of polygons.
- Polygon Hunting Find all the polygons that can be drawn by joining dots on this seven dot grid.

Here are some exam-style questions on this statement:

- "
*The exterior angle of a regular polygon is 72°*" ... more - "
*The diagram, not drawn to scale, show a polygon with one line of symmetry, AE.*" ... 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

Here is an Advanced Starter on this statement:

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

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