# G7c – Reflection

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# Part 1 – Reflection (easy)

Interactive GeoGebra activity—Reflection: easy
• Choose whether you want to rotate a triangle, a quadrilateral, or a pentagon.
• Move the blue points to change the shape.
• Move the green points to change the mirror line. You can also click and hold elsewhere on the mirror line in order to translate it.
• Click and hold to pan the grid. You can also use the zoom buttons to zoom in or out.
• Click “Show reflection” to show the reflected image.
With thanks to Jon Ingram, whose Transformations – Reflection worksheet is available here.Material modified to show image by default and embedded here under the CC-BY-SA 3.0 license.
Teacher resources for Part 1

# Part 2 – Reflection (hard)

Click the tabs for extension tasks…

1. A reflection maps $$(x,y)$$ to $$(-x,y)$$. What is the reflection?
2. A reflection maps $$(x,y)$$ to $$(x,-y)$$. What is the reflection?
3. A reflection maps $$(x,y)$$ to $$(y,x)$$. What is the reflection?
• What are the coordinates of the point to which a reflection in the line $$y=2$$ maps the point with coordinates $$(p,q)$$?
Interactive GeoGebra activity—Reflection on a grid with axes
• Choose whether you want to rotate a triangle, a quadrilateral, or a pentagon.
• Move the blue points to change the shape.
• Move the green points to change the mirror line. You can also click and hold elsewhere on the mirror line in order to translate it.
• Note that you can click the button to show/ hide the axes.
• Click and hold to pan the grid. You can also use the zoom buttons to zoom in or out.
• Click “Show reflection” to show the reflected image.
With thanks to Jon Ingram, whose Transformations – Reflection worksheet is available here.Material modified to show image by default and embedded here under the CC-BY-SA 3.0 license.
Teacher resources for Part 2