Proving the angle sum

Added by Kadie Armstrong on Feb 6, 2008

An interactive animation demonstrating the proof of the fact that the sum of internal angles of any triangle is 180º. Click the numbered buttons to observe the steps required for the proof.

This resource is from the unit Angles in Triangles which is part of Absorb Mathematics.

You might also like Sumdog - our new website with free numeracy games for 9 to 13 year olds.

Terms of Use

You may view the resource online free of charge. However, if you wish to download the resource then you must first purchase either Absorb Mathematics or Absorb Mathematics Resources.

Use download if you wish to use the resource offline or if you wish to include the resource in a PowerPoint presentation or in whiteboard authoring software provided by companies such as Promethean or Smart.

As well as Absorb, Crocodile Clips also published Yenka software for modelling mathematics. Yenka is free to use at home.

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