Half square on the left, full square on the right
Recall: $$$n$$$ is odd. Let $$$u=\lfloor{\frac{n}{2}}\rfloor$$$, $$$v=n-u$$$, $$$v-u=1$$$.
In the figures, $$$u$$$ is the number of polygon sides between $$$\sphericalangle{RWP}$$$, $$$v$$$ is the number of polygon sides between $$$\sphericalangle{PWM}$$$.
TODO: 1. Prove $$$\measuredangle{RMN}\leq\measuredangle{RMU}$$$