Question: In Example 1(a), change radius r to diameter d, write the appropriate equation, and find the value of the constant of proportionality. Data from Example

In Example 1(a), change radius r to diameter d, write the appropriate equation, and find the value of the constant of proportionality.

Data from Example 1(a)

The circumference c of a circle is proportional to (varies directly as) the radius r. We write this as c = kr. Because we know that c = 2πr for a circle, we know that in this case the constant of proportionality is k = 2π.

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