Why Is the Number π So Famous?

π is a number that shows up when you measure circles. If you take the distance around a circle (the circumference) and divide it by the distance across it (the diameter), you always get about 3.14, or π. It's like magic, no matter how big or small the circle is, this number stays the same!

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Examples

If you measure a round plate’s edge and divide it by its diameter, you get about 3.14.
A pizza with a radius of 2 inches has an area of about 12.56 square inches (π × 2²).
A wheel with a circumference of 10 feet has a diameter of about 3.18 feet (10 ÷ π).

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Categories: Math · pi,geometry,math history