Angle Theorem 9


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.

Featured Activity

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.

Find out about the latests developments on this website by signing up for a Transum Subscription. You will receive a regular newsletter and have access to the answers to most of the puzzles and activities on this site.

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments.

Recently Updated

Graph Equation Pairs

Graph Equation Pairs

Match the equation with its graph. Includes quadratics, cubics, reciprocals, exponential and the sine function. So far this activity has been accessed 198 times and only 1 person has earned a Transum Trophy for completing it.


©1997-2018 WWW.TRANSUM.ORG