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-- Draw a circle.

-- Put a mark at the center, and draw a line across the whole circle through the center.

-- Measure the length of the curved line all around the circle. (called the "circumference" of the circle)

-- Measure the length of the straight line across the circle. (called the "diameter" of the circle)

If you divide the circumference by the diameter, the result is 'pi'.

It doesn't matter how big or how small the circle is. The result is always the same.

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