This poster includes the definition of a quadrilateral as a polygon with four (4) sides, along with the definition, key attributes, and visual image of a rectangle and a square. This poster can be used as an anchor chart, or as a reference sheet in study guides, interactive notebooks, and math centers. Understanding quadrilaterals and classifying rectangles and squares are fundamental to geometry. These 2D figures lay the foundation for finding perimeter and area, and understanding how they rel