it is a number, normally used to calculate area or circumfurence of a circle
There is a pi button on your calculator it looks like this π
or if it is for without a calculator pi is equal to approximately 3.14
i hope this helped.
+229 To calculate the curcumference of the universe, you only need to use 39-40 digits of pi to have a very close estimate! (Inches off) also, you can calculate the curcumference of the earth with just 3.14, and be only 1 10 thousanth of an inch off!
