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 Form 2 Mathematics online lessons on reflections and congruence

Lesson on Reflection and Mirror Line

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Answer Text:
-A transformation of a figure in which each point is replaced by a point symmetric with respect to a line or plane e.g. mirror line.
Properties preserved under reflection.
-Midpoints always remain the same.
-Angle measures remain the same i.e. the line joining appoint and its image is perpendicular to the mirror line.
-A point on the object and a corresponding point on the image are equidistant from the mirror line.
-A mirror line is a line of symmetry between an object and its image.

To find the mirror line, join the points on the object and image together then bisect the lines perpendicularly. The perpendicular bisector gives us the mirror line.