# CENTROIDS AND SOME CHARACTERIZATIONS OF PARALLELOGRAMS

• Kim, Dong-Soo ;
• Lee, Kwang Seuk ;
• Lee, Kyung Bum ;
• Lee, Yoon Il ;
• Son, Seongjin ;
• Yang, Jeong Ki ;
• Yoon, Dae Won
• Published : 2016.07.31
• 49 5

#### Abstract

For a polygon P, we consider the centroid $G_0$ of the vertices of P, the centroid $G_1$ of the edges of P and the centroid $G_2$ of the interior of P, respectively. When P is a triangle, the centroid $G_0$ always coincides with the centroid $G_2$. For the centroid $G_1$ of a triangle, it was proved that the centroid $G_1$ of a triangle coincides with the centroid $G_2$ of the triangle if and only if the triangle is equilateral. In this paper, we study the relationships between the centroids $G_0$, $G_1$ and $G_2$ of a quadrangle P. As a result, we show that parallelograms are the only quadrangles which satisfy either $G_0=G_1$ or $G_0=G_2$. Furthermore, we establish a characterization theorem for convex quadrangles satisfying $G_1=G_2$, and give some examples (convex or concave) which are not parallelograms but satisfy $G_1=G_2$.

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#### Cited by

1. Various centroids and some characterizations of catenary rotation hypersurfaces vol.42, pp.13036149, 2018, https://doi.org/10.3906/mat-1703-61

#### Acknowledgement

Supported by : National Research Foundation of Korea (NRF)