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Line of Reflection

Line of Reflection

One-page printable reference

See It in Action

Two examples of the idea done right—and one common look-alike that is not right.

EXAMPLE

EXAMPLE

NON-EXAMPLE

Definition

A line of reflection is the mirror line over which a figure is reflected to produce a mirror image.

Key Points:

  • It’s the line that each point and its image are equidistant from.

  • The original figure and its image are symmetrical across this line.

  • Every point on the line of reflection stays in place during the reflection.

Example:

If a triangle is reflected over the x-axis, the x-axis is the line of reflection.


A triangle and its image after a reflection across the x-axis in the coordinate plane. The x-axis is exactly halfway in between the two triangles.

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Learn the whole picture

This term is one piece. Our courses build it into everything around it—short videos, practice, and the “why” behind every concept.

Algebra 1

Lines, slope, functions & more

Geometry

Shapes, proofs & spatial reasoning

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