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A circular plate rolls in contact with the sides of a rectangular tray. How much of its circumference comes into contact with the sides of the tray when it rolls around one circuit?

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An Introduction to Irrational Numbers

Tim Rowland introduces irrational numbers

Approximating Pi

Stage: 4 and 5 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Calculate the areas or perimeters (does it matter?) and average.