This lesson and interactive applet lets students explore geometric relationships and make and test conjectures. The main task centers on identifying what distinguishes a rectangle from a more general parallelogram. Students manipulate both figures and look for comparisons. Suggestions for implementation and supplemental tasks are provided.
Keywords:Grade 3,Make use of structure,NSDL,Grade 4,Grade 5,Critical thinking,Quadrilaterals,Visual representation,oai:nsdl.org:2200/20140728160731330T,Mathematics,Analyze and persevere,Concept formation,Process skills,Upper Elementary,Mathematical language,Express regularity,Transformations,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Geometry,Practice Standards,Elementary School,Representation,Communication,Plane geometry,Engineering,Vocational/Professional Development Education,Education,Construct arguments,Reasoning