Angle Theorem 9

Theorem

Below is an interactive version of the diagram. Drag the points to see how the diagram responds.

The following animation was created and is shared by Anthony C.M. OR under a License: CC-BY-SA.

Main Angle Theorems page.

When you think that the angle theorems are understood head for an Angle Activity.

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Maths Mind Reader

Maths Mind Reader

This spectacular magic trick never fails to amaze people of all ages assuming they can add and subtract very simple numbers. The mathematics comes in finding out how the trick works.

This is a Shine+Write visual aid designed to be projected onto a whiteboard for whole class exposition.

You can find other popular visual aids on our Shine+Write page.

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