What is the arc length of an angle of pi/3 radians formed on the unit circle?

This is the concept of geometry, the arc will be given by:

circumfrence=theta/360*π*diameter

given that:

theta=π/3 rad = 1/3*180=60°

diameter=1

The arc length will given by:

60/360*π*1

=π/6 units

=0.5236 units