An educational anchor chart sorting quadrilaterals into rectangles and non-rectangles based on the number of right angles.
A classroom anchor chart titled "Quadrilaterals" with two columns: "Rectangles" (4 sides, 4 right angles) and "4 sides, but not 4 right angles." Various paper cutouts of quadrilaterals (squares, rectangles, parallelograms, trapezoids) are labeled A through K and placed under the appropriate category.