4.G.3: Understanding and Identifying Lines of Symmetry in Two-Dimensional Figures
Grade: 4th Grade
Domain: G: Geometry
Standard Description
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 line-symmetric figures and draw lines of symmetry.
Domain Description
Understand how to draw and identify various geometric features such as points, lines, segments, rays, and variety of angles in 2D figures. Learn to categorize these 2D figures based on their characteristics like the presence of parallel or perpendicular lines, or specified angle sizes, noting the specific class of right triangles. Also, understand symmetry in 2D figures by recognizing a line across the figure that divides it into identical halves and being able to identify such figures and draw their lines of symmetry.