You
what 'PI' is ... it's a number with the value know3.14, and it's used
to find the circumference and area of a circle.
But did you ever wonder PI came from?
Did somebody wheremake it up? Was it invented? Where
it come from!?
doesPI is a truly magical number! The symbol itself is a Greek letter. irrational.) Because there is no predictable
pattern to the digits, we can never know all of them. But they can be calculated
... you can see the first 4000 decimal places (!) on our PI
page.
But where does the number come from?!? Imagine drawing some circles. You could draw a really tiny one. Or maybe a bigger one that fills your page. Or perhaps a large one on the blackboard. Even a gigantic one out in the field behind the school. Now imagine carefully measuring the diameter of each circle, or the distance across the middle , and then each circle's circumference, which is the distance around the outside.. Here's an example: When you do the calculation: 5.18 divided by 1.65 ... ...the result is the magic number 3.14, or PI!
Let's try it for a bigger circle: When you do the calculation: 40.5 divided by 12.89 ... ...the result again is the magic number 3.14, or PI! Let's try it for a really large circle now:
You might also be interested in visiting our page that explains where the area formula for a circle comes from! |