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Warm Up

Week 1. Warm Up. 01.04.12. Line of Reflection. The mirror in the transformation. Ex 1. Reflection on a plane: x-axis. •. •. Ex 2. •. •. -2. 2. Reflection on a plane: x-axis. B ( 3, 4 ). •. •. •. •. Ex 2. •. •. A ( 2, 2 ). 4. •. •. A’ ( 2, -2 ). -4. B’ ( 3, -4 ).

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Warm Up

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  1. Week 1 Warm Up 01.04.12

  2. Line of Reflection The mirror in the transformation. Ex 1

  3. Reflection on a plane: x-axis • • Ex 2 • • -2 2

  4. Reflection on a plane: x-axis B( 3, 4 ) • • • • Ex 2 • • A( 2, 2 ) 4 • • A’( 2, -2 ) -4 B’( 3, -4 ) Rule 1 If ( x, y ) reflects across the x-axis its image is ( x, -y ).

  5. Reflection on a plane: y-axis Ex 3 A’( -3, 2 ) A( 3, 2 ) If ( x, y ) reflects across the y-axis its image is ( -x, y ). Rule 2

  6. If a figure can be mapped onto itself by reflection. Lines of Symmetry Ex 4

  7. Theorem 7.1 Isometry A transformation that preserves angles and distances. Ex 5 Ex 6

  8. Do 1 : AB ? Do 2 : Do 3 : Do 4 : ∠DEF ? ∠GFE ? DG ? Assignment: Textbook page 407, 15 - 29 All.

  9. Line of Reflection The mirror in the transformation. Ex 1

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