Maryland College and Career-Ready Standards
MD.MA.4.G. Geometry (G)
4.G.A. Draw and identify lines and angles, and classify shapes by properties of their lines and angles.
4.G.A.2. Additional Standard: Classify two-dimensional 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.
4.G.A.2.1. Ability to use concrete materials to model the lines and angles of two-dimensional figures to provide visual evidence of the relationship between various figures.