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These are the Transum resources related to the statement: "Pupils should be taught to derive and illustrate properties of triangles, quadrilaterals, circles, and other plane figures [for example, equal lengths and angles] using appropriate language and technologies".

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

- Different types of Triangle Euclid and his friends explain how many different kinds of triangle there are.
- Circle Pairs Find the matching pairs of circle diagrams and circle properties in this interactive online game.
- Circle Parts Kim's Game A memory game to be projected to help the whole class revise the names for the parts of a circle.
- Circles Area and Circumference Video The circumference and area of a circle can be found if the radius or diameter are known.
- Polygon Angles Video A concise reminder about angles, both interior and exterior, in regular and irregular polygons.
- Circles Practise using pi to calculate various circle measurements. There are six levels of difficulty.
- Polygon Angles A mixture of problems related to calculating the interior and exterior angles of polygons.
- Circle Theorems Diagrams of the circle theorems to be projected onto a white board as an effective visual aid.
- Circle Theorems Exercise Show that you understand and can apply the circle theorems with this self marking exercise.
- Polygon Properties Connect the names of the polygons with the descriptions of their properties.
- Geometry Toolbox Create your own dynamic geometrical diagrams using this truly amazing tool from GeoGebra.

Here are some Advanced Starters on this statement:

**Geometry Snack**

Find the value of the marked angle in this diagram from the book Geometry Snacks more**Triangle or Quadrilateral**

Can a quadrilateral have a straight angle? more

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

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