It is important to know formulas of pi for circles like areas of a circle and its circumference
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Area= square the radius and times it by pie
think about it if you know these formulas and you have to measure a circle at some kind of job you have and you know how to measure it if you don't know well this is how. for the diameter of a circle it would be d=r*2 for radius it would be r=d*2
Here is the two formulas *= pie=3.14 Radius C=r2* Diameter C=d*
You times pie by the radius but you cant if you dont know the shape.
You Don't know because it goes on forever!