Geodesic
Extremal areas of polygons with fixed perimeter
Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial and algoritmic methods. Part XXX, Tome 481 (2019), pp. 136-145

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We consider the configuration space of planar $n$-gons with fixed perimeter, which is diffeomorphic to the complex projective space $\mathbb{C}P^{n-2}$. The oriented area function has the minimum number of critical points on the configuration space. We describe its critical points (these are regular stars) and compute their indices when they are Morse. Bibliography: 11 titles. 
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     title = {Extremal areas of polygons with fixed perimeter},
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G. Khimshiashvili; G. Panina; D. Siersma. Extremal areas of polygons with fixed perimeter. Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial and algoritmic methods. Part XXX, Tome 481 (2019), pp. 136-145. http://geodesic.mathdoc.fr/item/ZNSL_2019_481_a9/