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Meaning of the constant Pi

This math skill explains the concept of Pi in geometry related to circles. Pi is the constant representing the ratio of a circle's circumference to its diameter, approximately equal to 3.14159, and is used extensively in calculations involving circles.

Learn meaning of the constant Pi

Teaching Transcript

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What does 'Pi' mean in the geometry of circles?

For every circle, no matter its size, the distance around is a bit more than 3 times the distance across

In fact, it's 3.14159, and continues forever

So we just use a Greek letter, called Pi, to represent this number that is a bit more than 3

All Pi is is the ratio of a circle's circumference to its diameter, and you'll use that a lot when working with circles

Skill Practice

Meaning of the constant Pi

Test your understanding of meaning of the constant Pi by practicing it! Work through the below exercises to use it in practice.