Shape
Description
Polygon
A closed figure made of line segments each of which intersects with exactly two other line segments.
Quadrilateral
4-sided polygon
Square
A quadrilateral having all sides equal in length and forming right angles.
Triangle
A 3-sided polygon (sum of internal angles = 180°)
Rectangle
A 4-sided polygon with all right angles.
Parallelogram
4-sided polygon with two pairs of parallel sides.
Pentagon
5-sided polygon (the graphic shows a regular hexagon with "regular" meaning each of the sides are equal in length)
Hexagon
6-sided polygon
Heptagon
7-sided polygon
Octagon
8-sided polygon