For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.
Identify line-symmetric figures and draw lines of symmetry.Ĭ.5.G.B.3 Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. Recognize right triangles as a category, and identify right triangles.Ĭ.4.G.A.3 Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify these in two-dimensional figures.Ĭ.4.G.A.2 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 rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.Ĭ.4.G.A.1 Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. 3.G.A.1 Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals).
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