The circle is defined as the set of points on the plane with a given distance to the center. That distance is the radius. So the "circle constant" should be defined using the radius, not diameter. It has been proposed that this constant would be denoted by the Greek letter tau. Tau is equal to 2*pi.
The full angle (360 degrees) in radians is one tau instead of two pi, which is a more simple and natural way of doing things.
Also Euler's identity is in my opinion even more beautiful when using tau instead of pi:
e^(i*tau) = 1
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