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Learning objective overview
Master Teaching Guide coverage for this objective.
Current NZC (2007)
GM4-8
New NZC (2026)
NZC26-P4-GEO-SPR-K-Y9-01NZC26-P4-GEO-SPR-P-Y9-02
Resources
- CorbettMaths Reflections practice questionsQuestions PDF · Answers
- Dr Austin Describing Reflections Practice GridQuestions PDF · Answers
Terminology
- reflection
- line of reflection
- mirror line
- invariant point
- oblique line
- image
- object
Task goals
- Reflect a shape or point in the x-axis, y-axis, or a line such as x = a or y = b, reading the image coordinates off a grid.
- Reflect a shape or point in an oblique line, including y = x and y = -x.
- Identify which points, if any, remain unchanged (invariant) under a given reflection.
- Given an object and its image, determine and state the equation of the line of reflection, including for less common oblique mirror lines.
Where this fits
What leads into this objective, and where it goes next.
You are here
Reflection: Lines of Reflection, Invariant Points and the Mirror Line
Know
A set of points in a plane can be transformed by translation, reflection about a line, and rotation about a fixed point.
Statement▸
Year 9 · Geometry · Spatial reasoning
NZC26-P4-GEO-SPR-K-Y9-01
Do
Transforming 2D shapes in the coordinate plane by translation, reflection about a given line of symmetry, and rotation about a given point by a multiple of 90 degrees
Statement▸
Year 9 · Geometry · Spatial reasoning
NZC26-P4-GEO-SPR-P-Y9-02
Also under GM4-8:
For teachers
Need the fuller teaching notes for this objective? Open the Teacher guidance PDF.