Question: The circumference Cof a circle is a function of its radius given by C(r)=2r. a. Express the radius of a circle as a function of

The circumference Cof a circle is a function of its radius given by C(r)=2r.

a. Express the radius of a circle as a function of its circumference. Call this function r(C).

Enter the exact answer.

Enclose numerators and denominators in parentheses. For example, (ab)/(1+n)

r(C)=

b. Find r(28)and interpret its meaning.

r(28pie)=

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