Draw three different quadrilaterals that are not rectangles. Then describe to a younger student how to draw a quadrilateral that you are sure is not a rectangle.
Use the definitions of different quadrilaterals from the Lesson 5.1.1 Math Notes to help you draw three quadrilaterals which are not rectangles.
Before you learned about angles and polygons, how would you have best understood the difference
between rectangles and other quadrilaterals? Consider this as you write the description for a younger student.