A quarter arc of the unit circle is a quarter τ (τ/4). A half arc of the unit circle is a half τ. A 5/19ths arc of the unit circle is 5/19ths τ. How much simpl

A quarter arc of the unit circle is a quarter τ (τ/4). A half arc of the unit circle is a half τ. A 5/19ths arc of the unit circle is 5/19ths τ. How much simpler could it get? Defining the unit circle as a circle with area τ is a contradictory statement and is semantically invalid.