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mathematicsprinted 122 · PDF 123
165 pagesrevision 46935
printed 122 · PDF 123
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The distances from the centre of enlargement to the enlarged image will be in the
same direction for a positive scale factor and the opposite direction for a negative
scale factor
STEP 4:
Repeat STEPs 1 to 3 for the remaining vertices
STEP 5:
Connect the vertices on the enlarged image and label it
How can we describe an enlargement?
You need to be able to identify and describe an enlargement when presented with
one
You must fully describe a transformation to get full marks
For an enlargement, you must:
State that the transformation is an enlargement
State the scale factor
Give the coordinates of the centre of enlargement
Translation:
What is a translation?
A translation is the movement of a shape
The size, shape and orientation (which way up it is) of the shape stays
the same
How can we translate a shape?
The movement of a translation is described by a vector
You need to know how to write a translation using a vector (rather than
words)
Vectors are written as column vectors in the form X/Y where:
Xis the distance moved horizontally
Negative means move to the left
Positive means move to the right
Y is the distance moved vertically
Negative means move down
Positive means move up
STEP 1:
Select a vertex on the original object, move it according to the
information given in the column vector
STEP 2:
Repeat STEP 1 for each of the vertices on the original object