I posted this radians animation on Twitter last night (originally featured in this blog post) and judging by the number of retweets, I guess others like it as much as I do. There's more gifs like this here.

The animation below shows how the exterior angles of a polygon sum to 360

^{o}. Sometimes it's better to use an animation that you can pause and talk through though, so I prefer this animation for exterior angles of a polygon. Absorb Learning is an excellent website for animations.
Another example of an animation you can pause during teaching is this 'bisecting an angle' tool. It comes with both a clear instruction sheet for students and associated proofs. There are similar pages for every possible construction! As I mentioned in a previous post, I hate teaching constructions, so I find this very helpful.

Here's another maths gif. This one is for demonstrating the properties of parabolas, as taught in Further Maths. This can also be demonstrated nicely using Desmos.

Here's another maths gif. This one is for demonstrating the properties of parabolas, as taught in Further Maths. This can also be demonstrated nicely using Desmos.

I also want to mention PhET simulations. I don't teach mechanics but I'm told that PhET has lots of great interactive simulations for demonstrating concepts. 'Balancing Act' is a good example. They also have simulations for Key Stage 3 topics such as fractions - see the full maths selection here. The simulations can be downloaded and run from your school network.

Balancing Act - PhET |

Aren't we lucky to have such excellent technology to enhance our teaching?

If you know of any other good animations or interactive tools, please comment below or tweet me.

Since writing this post I've become aware of a new website www.mathimation.co.uk - well worth a look.

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