TEKS 4.6B: Lines of Symmetry
Identify One or More Lines of Symmetry
About this lesson
Learning Target: I can identify one or more lines of symmetry.
Focuses On:
- Determining if a figure is symmetrical
- Evaluating given lines of symmetry
- Creating lines of symmetry
Builds On:
3.6A:
Classify and sort two- and three-dimensional figures, including cones, cylinders, spheres, triangular and rectangular prisms, and cubes, based on attributes using formal geometric language.
Next Level:
6.8B
Model area formulas for parallelograms, trapezoids, and triangles by decomposing and rearranging parts of these shapes.
6.8D
Determine solutions for problems involving the area of rectangles, parallelograms, trapezoids, and triangles and volume of right rectangular prisms where dimensions are positive rational numbers.
Read More:
This lesson is designed to support student understanding of symmetry, how to determine if an object has a line of symmetry, and how to draw a line of symmetry.
The two instructional blocks in this lesson focus on symmetry foundations and identifying lines of symmetry.
In the first instructional block, students examine what it means for a shape to be symmetrical. Students practice identifying if a shape is symmetrical or not, and also determining if it has one or more lines of symmetry.
The second instructional block focuses on evaluating lines drawn on figures to determine if they are a correct line of symmetry. Students will also create their own lines of symmetry on given figures.
Scaffolds and supports such as pictorial representations and visual models are intentionally built throughout the lesson to support conceptual learning.
Grade 4MathTEKS 4.6B