GeoGebra Classroom

# Exploring Reflections

## Create a polygon!

Part 1:
1. Use the polygon tool: to create a quadrilateral on the coordinate plane below.
2. Select one of the vertices of your quadrilateral and show the name of it by selecting the text tool:  and select "name".  Repeat this process for all of the vertices. *Note: make sure before you select something, you have clicked on the move tool: !!
3. Use the reflect about line tool:  by clicking first on the tool, then one of the vertices of the quadrilateral, and finally click on the x-axis.
4. Repeat step 3 for all of the vertices of your quadrilateral.
5. Record the coordinate pair for the original quadrilateral and the image.
Part 2:
1. ﻿Use the polygon tool: to create a quadrilateral on the coordinate plane below.
2. ﻿Select one of the vertices of your quadrilateral and show the name of it by selecting the text tool:  and select "name".  Repeat this process for all of the vertices. *Note: make sure before you select something, you have clicked on the move tool: !!
3. Use the reflect about line tool:  by clicking first on the tool, then one of the vertices of the quadrilateral, and finally click on the y-axis.
4. Repeat step 3 for all of the vertices of your quadrilateral.
5. ﻿Record the coordinate pair for the original quadrilateral and the image.

## Questions:

1. What do you notice happens with the coordinates of the points when you reflect the quadrilateral over the x-axis?
2. What do you notice happens with the coordinates of the points when you reflect the quadrilateral over the y-axis?