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1.1 Line Symmetry

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1.1 Line Symmetry

1. 1. 6.1 Line Symmetry 1 May 12, 2014 Chapter 1. Symmetry & Surface Area
2. 2. 6.1 Line Symmetry 2 May 12, 2014 1.1 Line Symmetry What is symmetry? What does it mean to be symmetrical?
3. 3. 6.1 Line Symmetry 3 May 12, 2014 Symmetry: ­ The word symmetry is derived from the Greek prefix “syn” which means together, and the Greek Suffix “metron” indicating measurement. ­ An object or image has symmetry if it is balanced and can fit onto itself either by reflection or rotation. ­ The mirrored nature of the two sides of the image is called symmetry. http://www.mytextbook.ca/product/9780070712577/offline_files/resources/specials/Section1.1/i ndex.html Definitions
4. 4. 6.1 Line Symmetry 4 May 12, 2014 Symmetry often appears in art and architecture
5. 5. 6.1 Line Symmetry 5 May 12, 2014 A mirror image of an object is a reflection of the object. The reflection in the mirror is an exact copy of the image when folded over the line of reflection. The actual placement of the mirror is the line of reflection. Each part must be the mirror image of the other part. Since both sides of the image are equal, they are symmetrical. This is line symmetry. http://www.mytextbook.ca/product/9780070712577/offline_files/resources/specials/Section1.1/i ndex.html Definitions
6. 6. 6.1 Line Symmetry 6 May 12, 2014 Line Symmetry: A type of symmetry that involves dividing an object orimage into two identical reflected halves by drawing a straight line through the object. This line is called the line of symmetry. This line can be in any direction; that is a vertical line, a horizontal line, or a oblique (diagonal) line. http://www.mytextbook.ca/product/9780070712577/offline_files/resources/specials/Section1.1/i ndex.html Definitions
7. 7. 6.1 Line Symmetry 7 May 12, 2014 http://www.mytextbook.ca/product/9780070712577/offline_files/resources/specials/Section1.1/i ndex.html There are 3 types of line symmetry: Horizontal Vertical Oblique
8. 8. 6.1 Line Symmetry 8 May 12, 2014 Ex #1­ Consider the following letters and diagrams. Find and draw a line of symmetry for each if possible. Use a Mira to verify your lines of symmetry. a) A b)           C
9. 9. 6.1 Line Symmetry 9 May 12, 2014 Ex #1­ Consider the following letters and diagrams. Find and draw a line of symmetry for each if possible. Use a Mira to verify your lines of symmetry. a) A b)           C
10. 10. 6.1 Line Symmetry 10 May 12, 2014 Ex #1­ Consider the following letters and diagrams. Find and draw a line of symmetry for each if possible. Use a Mira to verify your lines of symmetry.
11. 11. 6.1 Line Symmetry 11 May 12, 2014 Ex #1­ Consider the following letters and diagrams. Find and draw a line of symmetry for each if possible. Use a Mira to verify your lines of symmetry.
12. 12. 6.1 Line Symmetry 12 May 12, 2014 Some objects or images have more than one line of symmetry.
13. 13. 6.1 Line Symmetry 13 May 12, 2014
14. 14. 6.1 Line Symmetry 14 May 12, 2014 Some objects or images have more than one line of symmetry.
15. 15. 6.1 Line Symmetry 15 May 12, 2014 Ex. 3. Draw a rectangle and find all lines of symmetry. Explain why a rectangle has no oblique lines of symmetry
16. 16. 6.1 Line Symmetry 16 May 12, 2014 Ex. 4 Does a parallelogram have any lines of symmetry?
17. 17. 6.1 Line Symmetry 17 May 12, 2014 Completing Images You can complete images by using line symmetry. Simply copy the part of the image given across the line of symmetry
18. 18. 6.1 Line Symmetry 18 May 12, 2014 Ex5. Draw and label the image of the shape after...
19. 19. 6.1 Line Symmetry 19 May 12, 2014 page 12 Questions 4 ­ 9, 13, 15, 19