Lesson Plan : Lines of Symmetry

Teacher Name:
 Ms. Pressley
 Grade 4

 Developing Geometric an Spatial Sense
 Determine lines of symmetry and half-turn symmetry.
 Students will be able to determine lines of symmetry. Students will be able to determine whether or not a figure has half-turn symmetry.
 Scissors,Paper,Shape sheet,Sir Circumference and the First Round Table by Cindy Neuschwander, Projector,Transparency,Shape cutouts,Practice questions,Reinforcement questions
 1.Have students see how many ways they can fold a sheet of paper so the two halves match exactly. Two ways
 2.Hand out paper circles to students. Ask: When you fold the circle in half, do the two parts of the circle match exactly? When two parts of a figure match exactly, the fold line is a line of symmetry. 3. Ask: To show a line of symmetry does it matter where you fold the circle? Yes How many lines of symmetry do you think a circle has? More than can be counted 4. Another name for a line of symmetry of a circle is a diameter. When you fold the half circle to make a right angle, this fold line is called a radius. Show diameter and radius of a circle on overhead projector for a visual for students. 5. Hand out rectangle and worksheet with rectangle of the same size on it. 6. Turn the rectangle a quarter of the way around. Does the cutout match the drawing? No 7. Now turn the rectangle so that it is half of the way around. Does the cutout rectangle match the drawing? Yes 8. If a cutout matches its drawing when it is turned half way around, the figure has half-turn symmetry. 9. Ask: Does the rectangle have half-turn symmetry? Yes Does the circle have half-turn symmetry? Yes
 Hand out cutouts and sheets of the same size for the following shapes: square, triangle, rectangle, circle, parallelogram, octagon. Have students answer the following questions: Which figures have half-turn symmetry? Which of your cutout figures has no lines of symmetry?
Checking For Understanding:
 Students will be assessed on the completion of the practice and reinforcement questions. Students will also be assessed on the participation in answering the Sir Cumference and the First Round Table questions.
 Read Sir Circumference and the First Round Table to the class. Stop while reading and ask students some of the following questions: Can you make a square out of a rectangle? What is a parallelogram? What does parallel mean? What is the diameter of a circle? What is the radius?
 Were all steps in lesson plan completed?

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