11.4 Translations and Reflections

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Presentation transcript:

11.4 Translations and Reflections Objective: Students will be able to demonstrate how to translate and reflect coordinates. They will also be able to explain what effect it has on size/shape/area. 11.4 Translations and Reflections

Definitions Transformation: maps original figure onto new figure. Image: new figure. Types Translation Reflection Rotation dilation

Translations Translation: slide a figure. Translation Info Called a slide Same shape and size Orientation is the same. Area/Perimeter not affected

Translate down 2 and right three. Translate 3 up and 2 left.

Translations - st Translate up 2, right 3, down 4 Translate down 3 and left 6

Reflections Reflection: flip a figure over a line. Line of symmetry: line figure flipped over. Usually x or y axis Reflection info Called a flip Figures mirror image Same shape/size Orientation different Area/Perimeter not affected

Reflection - t Reflect over x-axis Reflect over y-axis and then x-axis.

Reflection - st Reflect over the y-axis Reflect over y axis and then x axis.

Reflection or Translation

Wrap-up Questions/Comments Hw: activity Objective: Students will be able to demonstrate how to translate and reflect coordinates. They will also be able to explain what effect it has on size/shape/area.

Activity 1. On your coordinate plane, plot the following points and connect them in order ending with D to A(make sure you label with the letter): A(-9,8), B(-2,8), C(-5,5), D(-5,2). Then from those points reflect over the y-axis. Then reflect over x-axis. Finally translate it 5 to the left and 3 down.