Page 370 - Math Smart - 7

CHAPTER 16.2

In this chapter
Translation, Reflection
Pupils should be able to:

• transform 2D points and
shapes by: and Rotation
o translation
o reflection
o rotation
16.2.1 Translation

^ RECALL Translation is a movement. Every point of

the object is moved in the same direction M
The coordinates of a for the same distance.
N
polygon PQRS is (5, 6),
The image and the object are congruent.
(2, 5), (1,8) and (3, 8).
Let us use coordinates to describe
Translate the polygon 5
translation of shapes.
units down. What are the
coordinates of the vertices Look at the polygon on the right.
of its image? The coordinates of its vertices are:
D(0,-2) E(3,-2) F(4,-3)
G{3.-4) H{0.-4) 1 (1,-3)

Let us look at where the vertices of the
Image of polygon DEFGHI will be after
we translate the polygon 6 units up and
-5 -4 -3 -I -ns ■*-x
4 units to the left. I 1

The coordinates of the vertices of the
image are:
D'(-4, 4) E'(-1,4) F'(0, 3)
G'(-1,2) H'(-4,2) I'(-3, 3)

-5 -4 -3 -2 -1 0

UNIT 16 I Transformation