The Plastic Brain

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This is an old trick for finding the centre of a circle (this particular example being drawn from a Russian book, published in 1986).

How does it work? It’s based on Thales’ Theorem, which states that if points A and C (below) are the ends of a diameter, then joining them to a third point on the circle, B, will always form a right angled triangle, no matter where B lies.

Author: Rogan Tinsley

Biology, science and maths teacher with a PhD in Neuroscience and passion for education.

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