a pentagon
A rhombus is a closed 2-dimensional figure with four straight sides of equal length.
The formula for a rhombus is as follows: "a closed 2-dimensional figure with four straight sides of equal length".
A polygon is a 2-dimensional closed figure that has at least three sides. A pentagon is a 2-dimensional closed figure that has five and only five sides, so it is a kind of polygon.
If it is a 2-dimensional figure, it is a polygon.
A rectangle
A simple polygon is a closed, straight-sided figure in which the sides do not overlap.
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
rhombus
Three straight sides Closed figure two dimensional three angles
A rectangle that is not a square. Or a trapezoid.
A rectangle