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Thursday, January 19 th

Thursday, January 19 th. Please complete the warm up and write down your homework Please have your own angle matches out . Warm Up. Simplify Write an expression for 2 times three more than twice a number. Corny Joke of the Day. Why did Wesley bring a ladder to school?

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Thursday, January 19 th

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  1. Thursday, January 19th Please complete the warm up and write down your homework Please have your own angle matches out Warm Up Simplify Write an expression for 2 times three more than twice a number

  2. Corny Joke of the Day Why did Wesley bring a ladder to school? Because he wanted to get to high school

  3. Angle Match • Using the cards you made last night….. • Switch your cards with the person who is sitting to your left • Then, try to categorize their cards into the four main angle types!

  4. Symmetry

  5. Our Mission Learn to identify line symmetry.

  6. Making Unusual Shapes • Fold your piece of paper in half • Cut an unusual shape from it • Unfold it • What do you notice? • The parts of the shape • What does the folded line represent?

  7. A figure has line symmetry if it can be folded or reflected so that the two parts of the figure match, or are congruent. The line of reflection is called the line of symmetry.

  8. Part 1 Lines of symmetry in regular polygons Regular polygons: All side lengths and angles are congruent

  9. Can you find the rule? Find the number of lines of symmetry in each shape and fill out the chart.

  10. 4 lines of symmetry

  11. Discovery For a regular polygon the lines of symmetry is the same as the number of sides!

  12. Fun Fact A dodecagon is a 12-sided regular polygon. This means that it has ___________lines of symmetry!

  13. Part 2 Determining if the lines given are the lines of symmetry

  14. #1 Determine whether each dashed line appears to be a line of symmetry. The two parts of the figure appear to match exactly when folded or reflected across the line. The line appears to be a line of symmetry.

  15. #2 Determine whether each dashed line appears to be a line of symmetry. The two parts of the figure do not appear congruent. The line does not appear to be a line of symmetry.

  16. #3 Determine whether each dashed line appears to be a line of symmetry. The two parts of the figure do not appear congruent. The line does not appear to be a line of symmetry.

  17. #4 Determine whether each dashed line appears to be a line of symmetry. The two parts of the figure appear to match exactly when folded or reflected across the line. The line appears to be a line of symmetry.

  18. Group Discussion How many lines of symmetry does the following shape have?

  19. NOT EVERY SHAPE HAS A LINE OF SYMMETRY

  20. Smile Symmetry Is there a line of symmetry. If so, how many? 1 line of symmetry

  21. Logo SYmmetry

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