The Golden Triangle SEZ is a sinister Sin City. At the heart of it is an alleged Chinese crime lord named Zhao Wei. In 2007, Zhao negotiated a 99-year lease over the land with the Laotian government.

The unit circle is defined as a circle of radius 1, centred on the origin. The circumference around a circle is given by \(C = 2\pi{r}\). As the radius of the unit circle is 1, the circumference is ...