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  "body": "\n## Summary\n\nA polygon is a plane figure bounded by a closed chain of finitely many straight segments.\nThe segments are its edges and their endpoints are its vertices.\nTriangles, quadrilaterals and [[regular polygons|01KJJ9A400]] are polygons.\nPolygons are the basic building blocks for area, triangulation and much of discrete geometry.\n\n## Explanations\n\n### L1 human\n\nPut some dots on a sheet of paper and join them in order by straight lines, coming back to the first dot at the end.\nThe closed path you draw is a polygon.\nA square with corners $(0, 0)$, $(1, 0)$, $(1, 1)$, $(0, 1)$ is a polygon with four edges.\nIf the path never crosses itself, the polygon encloses a single region of the plane.\n",
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