pi is used to work out things like the circumference (length around the outside) of a circle from the diameter (length from side to side (pi x d). It can also work out a circle's area (2pi x r(radius)), and much more with spheres and cylanders etc.
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"xi" symbol in maths if used mostly in ven diogrammes and is in the top, right hand corner
By definition Pi is the relation between the radius and circumference of a circle.
It isn't clear what you mean. I don't think that "pi form" is a commonly used math term.
Algebra is used in lots of differant ways in everyday life because it's maths.
a story of maths on topic use of maths in our daily life