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2 dimensional (plane) figures can have three or more straight edges as sides. 3 dimensional (solid) figures can have four or more plane sides (faces). They can have fewer sides if the sides are not straight.
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
The formula for a rhombus is as follows: "a closed 2-dimensional figure with four straight sides of equal length".
It is a 2-dimensional figure. It has THREE or MORE sides.
A two-dimensional figure with six sides is called a hexagon. A hexagon has six straight sides and six angles. It is a polygon because it is a closed shape with straight sides. The sum of the interior angles in a hexagon is always 720 degrees.