Lesson 99 Symmetry.notebook March 04, 2013 1 Lesson 99 Symmetry.notebook March 04, 2013 Lesson 99 Symmetry and Reflections Reflectional Symmetry When one half is a mirror image of the other half. Line of Symmetry A line that divides a figure with reflectional symmetry into 2 congruent halves. Reflection A transformation that flips a figure over a line of reflection. Line of Reflection A line across which a figure is reflected. 2 Lesson 99 Symmetry.notebook March 04, 2013 A figure has line symmetry if you can draw a line through it to form two congruent shapes that are reflections of each other. Line Symmetry Notes A rectangle has 2 lines of symmetry. How many lines of symmetry do you think a circle has? How many lines of symmetry do these figures have? 3 Lesson 99 Symmetry.notebook March 04, 2013 Line Symmetry can be found in everyday objects. You can't escape line symmetry!!!!! It's EVERYWHERE! How many lines of symmetry does the United States flag have? 0 Zero! Erase here to find out! 4 Lesson 99 Symmetry.notebook March 04, 2013 How many lines of symmetry can be found in each of the regular polygons below? What can you conclude about the lines of symmetry found in regular polygons? Pull The number of lines of symmetry in regular polygons is equal to the number of sides. 5 Lesson 99 Symmetry.notebook March 04, 2013 A figure has rotational symmetry if, when rotated less than 360 a central point, it coincides with istelf. o around Rotational Symmetry Notes 90o 0o 180o 270o 6 Lesson 99 Symmetry.notebook March 04, 2013 7 Lesson 99 Symmetry.notebook March 04, 2013 Rotational Symmetry 90o Pull etermined by ated and fit on itself. What will the X look like after a 90 o turn? It will look the same. 0o 180o Turn the X to see its order of rotational symmetry. It is Order 4 270o 8 Lesson 99 Symmetry.notebook March 04, 2013 9
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