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Derive the formulas C = d•pi and C = 2r•pi.
by the definition of pi (π) is the circumference c of any circle divided by its diameter d
Put as an equation, pi is defined as π=c/d
Rearranging this to solve for c we get c=π*d
The diameter of a circle is twice its radius, so substituting 2r for d
c=2π*r