\( \DeclareMathOperator{cosec}{cosec} \)

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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.

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.