Chapter 10: Reflection and translation

By the end of this chapter you will be able to

• Describe a translation by the squares across (left or right) and then the squares up or down
• Draw a translation by moving every corner the same number of squares
• Explain that a reflection flips a shape, and that each point and its image are the same distance from the mirror line, on opposite sides
• Draw a reflection in a vertical or a horizontal mirror line, and find a mirror line from a point and its image
• Explain that a translation or a reflection keeps the size and shape, so the shape has not changed

You should already know

• Position and direction on a grid, and first-quadrant coordinates (Year 4, Chapter 10)
• Right angles, quarter turns and 2-D shapes (Year 4, Chapter 9 and Year 5, Chapter 9)
• Negative numbers on a number line (Year 5, Chapter 1)

Where this leads

• Coordinates in all four quadrants, and reflecting and translating shapes on the coordinate plane (Year 6, Chapter 11)
• Shapes, angles and circles, with the properties of the shapes that are moved (Year 6, Chapter 10)