Page 367 - Math Smart - 7

Object and image

Just like objects, shapes can also go through a change or a transformation. In the
transformation, the original shape is called the object, and the transformed shape
is called the image.

Translation Reflection Rotation
ine of r ifle :tio 1

ect LWfi
PSi

object image
W
imcige :en re (f f irec tior of
Otatlor 1'
)tat on

Investigate!

A B C

bbject 1
image
5

J
image

image

Q Identify each transformation above.
Q Measure the dimensions (sides and angles) of the shape and the image In
each transformation.
Label the dimensions on each shape.
Q Compare the dimensions of the object to the image for each
transformation. What do you see?

Notice that each object's shape and size did not change in each transformation. In
translation, reflection and rotation, the object and the image are of the same size
and shape. Only the orientation or position of the object has changed. We say the
object and the image are congruent.