Warm Up 01.04.12 Week 1. Section 7.2 Day 1 I will identify and use reflections in a plane. Ex 1 Line of Reflection The mirror in the transformation.

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Presentation transcript:

Warm Up Week 1

Section 7.2 Day 1 I will identify and use reflections in a plane. Ex 1 Line of Reflection The mirror in the transformation.

Reflection on a plane: x-axis Ex 2 2-2

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

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

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

Isometry A transformation that preserves angles and distances. Reflection Theorem A reflection is an isometry. Theorem 7.1 Ex 5Ex 6

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

Section 7.1 Day 1 I will identify and use reflections in a plane. Ex 1 Line of Reflection The mirror in the transformation.