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
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a formula that uses pi is the circumference and area of a circle and every polyhedron that has a circle
So that you may skip the derivation process every time you have to calculate something
a circle within a circle within a circle decrealsing in size every time
It is the center of the circle
If one is, they all are!