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Tuesday, January 31 st

Tuesday, January 31 st. Please get a new warm up and complete Please take out HW (pictures, cartoon, and worksheet). Warm Up. If two shapes are similar and the given shape has an area of 12 in ². What would be the area of the resulting shape if the scale factor is 8

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Tuesday, January 31 st

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  1. Tuesday, January 31st Please get a new warm up and complete Please take out HW (pictures, cartoon, and worksheet) Warm Up If two shapes are similar and the given shape has an area of 12 in². What would be the area of the resulting shape if the scale factor is 8 If two shapes are similar and the given shape has a perimeter of 84 cm. What would be the perimeter of the resulting shape of if the scale factor is 7.5

  2. Corny Joke of the Day What’s harder to catch the faster you run? Your breath

  3. What did Selena do wrong? Find the Missing side length given the two similar shapes x 15 12 45

  4. Important Test #2 Friday February 3rd

  5. Homework Answers

  6. Rotation Symmetry Extension

  7. Review

  8. A figure has rotational symmetry if, when it is rotated (turned) less than 360° around a central point, it coincides with itself (Looks exactly the same) • The central point is called the center of rotation. • A figure that coincides with itself after a rotation of 180° has rotational symmetry

  9. Determining Rotation Symmetry

  10. Tell how many times each figure will show rotational symmetry within one full rotation. Draw lines from the center of the figure out through identical places in the figure. Count the number of lines drawn. The figure will show rotational symmetry 4 times within a 360° rotation.

  11. Tell how many times each figure will show rotational symmetry with one full rotation. Draw lines from the center of the figure out through identical places in the figure. Count the number of lines drawn. The figure will show rotational symmetry 3 times within a 360° rotation.

  12. Insert Lesson Title Here Tell how many times each figure will show rotational symmetry within one full rotation. Draw lines from the center of the figure out through identical places in the figure. Count the number of lines drawn. The figure will show rotational symmetry 4 times within a 360° rotation.

  13. Practice Time

  14. Degree of Rotation • The smallest number of degrees that a figure can be turned and still look identical to itself. Trace the following figure. Rotate the figure and determine the degree of rotation (what degree does it start looking identical to the original?)

  15. Finding the Degree of Rotation Can be found by: 360° ÷ # of lines of symmetry

  16. Practice Time

  17. Scale Factor Project Step 1: Complete tasks 1-2 using a ruler Measure in Centimeters, round to the nearest 10th

  18. Scale Factor Project Step 2: Find the SCALE FACTOR: Resulting/Given Use the SCALE FACTOR to find perimeter and Area for question 4

  19. Scale Factor Project Step 3: Answer questions 6-8

  20. Scale Factor Project Step 4: Paste your comic on the small graph paper

  21. Scale Factor Project Step 5: With a ruler, lightly draw in the grid lines

  22. Scale Factor Project Step 6: Answer question 9. Find the perimeter and area of your original comic

  23. Scale Factor Project Step 7: Draw each square in the enlarged grid box

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