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A polygon is a 2 dimensional (2D) shape that has 3 or more straight edges (sides).
We draw dashes on sides that are equal in length.
An isosceles triangle is a polygon with 3 sides, two of them are equal in length.
A square is a polygon with four sides, all of them are equal in length.
A rectangle is a polygon with four sides. It has two pairs of sides which are equal, so we use a dash on one pair of sides, and two dashes on the other pair.
We draw arrows on sides that are parallel.
A trapezium is a polygon with four sides.
Two of the sides are parallel to each other.
A parallelogram is a polygon with four sides.
It has two pairs of sides which are parallel (and equal) to each other, so we use an arrow on one pair of sides, and two arrows on the other pair.
A regular polygon is a polygon that has all sides equal in length and all interior and exterior angles equal in size too.
A regular quadrilateral, a square
Note: The square is the only regular four sided polygon.
A regular pentagon
An irregular polygon is a polygon that does not have all sides equal in length.
An irregular parallelogram
An irregular pentagon
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