
Classify twodimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
Note: Triangles are not included in this unit or the map section shown below.
 Understand that attributes belonging to a category of twodimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.
 Classify twodimensional figures in a hierarchy based on properties.
 This map shows standards 4.G.2, 5.G.3, and 5.G.4 combined.