Theorem 4.1: The angle at Pj is 180-360j/n.

The angles at Pj-1 are 180-360(j-1)/n.

The angle at Pj-2 is 180-360(j-2)/n.

proof: The top angle follows from the fact that is a point on an {n/j} star, the middle angles are the supplements of the angles at the points of an {n/j-1} star, and the angle at the bottom is a vertical angle to an angle at a point on an {n/j-2} star.

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