C = πd
C = πr2
I'm not sure of the 3rd one (if there even is one), sorry
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It is a curved line that forms part of the circumference of a circle.
If it is a sector of a circle then the arc is the curved part of the circle which forms a boundary of the sector.
"Formula" is singular; the plural forms is formulae or formulas.
track
A pair of parallel lines, an ellipse or a circle.