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Ball Bearings

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The incircles of 3, 4, 5 and of 5, 12, 13 right angled triangles have radii 1 and 2 units respectively. What about triangles with an inradius of 3, 4 or 5 or ...?

Sums of Squares

Stage: 5 Challenge Level: Challenge Level:1

Try some examples of your own.

What do you notice about the squares?

If you think there is a pattern can you prove that it will always work out that way?