Page 193 - Maths Class 05

Slide

1. Slide or translate a figure.

2. Reflect a figure across a line.

Reflect
Rotate
3. Rotate a figure around a point.

Reflection

Object Image
Reflection, as you normally understand, is seeing the image of
something in a mirror. Mirror

If you stand in front of a mirror, the mirror image is the reverse image

of yours. Right becomes left and left becomes right in a mirror image.

Similarly, reflection in geometry is flipping a figure across a line such that it appears to
be the mirror image or reflection of the original object. Each point in the reflected

figure (mirror image) is at the same distance from the line as the corresponding point
in the original object. The line is called the mirror line or line of symmetry .

Look at the following reflection.

Mirror line
A A¢ DA¢B¢C¢ is the reflection of DABC in the given line.
As can be seen, the distances of points A¢, B¢ and

C¢ from the mirror line are the same as the
distances of points A, B and C respectively from

B C C¢ B¢ the mirror line.

Some examples of reflection are :

Mathematics-5 193