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Maths

Transformations

Reflections

When an object is transformed by a reflection the object and its image are always the same perpendicular distance from the mirror line.

Perpendicular means 'at right angles to'.

Examples:

image: a graph with two triangles plotted with the mirror line labelled

A and A' are the same perpendicular distance from the mirror line, as are B and B' and C and C'.

The object (ABC) has been reflected in the mirror line to give the image (A'B'C').

image: 4 lines of varying length with a mirror line down the middle of each

P and P' are the same perpendicular distance from the mirror line, as are Q and Q', R and R' and S and S'.

The object (PQRS) has been reflected in the mirror line to give the image (P'Q'R'S').

Back to Geometry and measures index

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