Tau: you spin me right round

Okay, so there still seems to be some confusion about Tau versus Pi. Tau is the full circle constant, and represents 360 degrees, so one rotation around a circle. Pi is the half circle constant, and represents 180 degrees, one half of a rotation around a circle. So writing your angle as 3*Pi is about the same as saying ''I walked three half-miles'' rather than ''I walked 1.5 miles.'' Everyone I know does not describe distances in half miles, but still most mathematicians I