Objective: Recognize lines of symmetry for given two-dimensional figures; identify line-symmetric figures and draw lines of symmetry.
In Lesson 12, students recognize lines of symmetry for two-dimensional figures, identify line-symmetric figures, and draw lines of symmetry. Given half of a figure and a line of symmetry, they draw the missing half. The topic then builds on students’ prior knowledge of two-dimensional figures and allows students time to explore each figure’s properties. Throughout this culminating topic, students use all of their prior knowledge of line and angle measure to classify and construct two-dimensional figures (4.G.2, 4.G.3).
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