A sextet is a group of 6 things. I think you are referring to Hexagon, which has 6 sides.
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An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Some of these have no parallel sides whereas a right hexagonal prism has 3 quartet of parallel sides and one sextet.
how many sides does an polygonshave
4 sides
how many sides convex quadilaterals have
How many parallel sides has a trapezium?