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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Without Lifting

Without Lifting

Can you draw these diagrams without lifting your pencil from the paper? This is an interactive version of the traditional puzzle. Some diagrams are possible while others are not. What is the rule?

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

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