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GCSE Mathematics · key term
A line that divides a shape into two halves which are mirror images of one another.
Used by AQA, Edexcel and OCR
Specification A11, G1 · Paper 1, Paper 2, Paper 3
The vertical line through the turning point of a parabola; points the same horizontal distance from it have equal -values.
Revise: Quadratic Graph PropertiesA quadratic graph is a mirror image on either side of its vertical line of symmetry.
A line that divides a shape into two parts which are exact mirror images of each other.
Specification A11, G4 · Paper 1, Paper 2, Paper 3
The vertical line through a parabola's turning point, with one half of the graph reflecting the other.
Revise: Quadratic FunctionsA vertical line through the turning point is the line of symmetry.
A line that divides a shape into two matching reflected halves.
Specification 7.01c, 8.04c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
The vertical line through a quadratic graph’s turning point, with matching points at equal distances on either side.
Revise: Quadratic Graphs: Roots and Turning PointsThe two roots are equally far from the vertical line of symmetry.
Test a proposed line of symmetry by imagining the shape folded along it: every point on one side must coincide with a point on the other.
For a line of symmetry, imagine folding the shape along the proposed line. Every vertex and edge must match exactly.
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