An Autograph Activity to demonstrate why the angles in a triangle add up to 180 degrees. The interesting thing about this activity is that it has no numbers! So really it is a demonstration that the angles in a triangle when put together form a straight line. This activity was inspired by the awesome Oliver Byrne's 'The Elements of Euclid'. Mathematics is not just about numbers, using colours in this example hopefully demonstrates that.
Tes classic free licence

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