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Mathematics: Circumference of circles

CIRCUMFERENCE OF CIRCLES

In this module, you can study how to calculate the distance around a circle (its circumference) if you know its diameter.

 

The above video from Khan Academy provides an excellent introduction to understanding the radius, diameter and circumference measures of a circle.

Did you know?

Pi is the name for a very long number:   3.1415926535897932384626433832795028841971...

The symbol for pi is:  π

A scientific calculator has a button 'π' to press if you need to use pi.

 

Formula for calculating a circle's circumference:  2πr   

This means:  2 x 3.14...(π) x radius length

 


Study and practice

'PI' ON A SCIENTIFIC CALCULATOR

ONLINE SCIENTIFIC CALCULATOR

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