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mathematicsprinted 121 · PDF 122
165 pagesrevision 46935
printed 121 · PDF 122
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STEP 1:
Place the tracing paper over page and draw over the original object
STEP 2:
Place the point of your pencil on the centre of rotation
STEP 3:
Rotate the tracing paper the angle that has been asked for in the question, it will
usually be an "easy" angle such as 90o, 180o or 270o
STEP 4:
Your tracing paper is in the position showing you where to draw the rotated image,
carefully draw the image onto the coordinate grid
How can we describe rotation?
State that the transformation is a rotation
State the centre of rotation (the point about which the object is rotated)
State the angle of rotation (how many degrees around the point that the object has
been rotated)
State the direction of rotation (clockwise or anticlockwise, unless the angle is 180o,
then a direction is not required)
Enlargement:
An enlargement is a transformation that changes the size of the shape
The scale factor tells you how many times bigger each edge of the enlarged image
will be compared to the corresponding edge on the original object
If the scale factor is greater than 1, the enlarged image will be bigger than the
original object
If the scale factor is less than 1, the enlarged image will be smaller than the original
object
The position of a shape will also change with enlargement
The orientation of the shape will be the same for a positive enlargement
How can enlarge a shape?
You need to be able to perform an enlargement (on a coordinate grid)
STEP 1:
Starting from the centre of enlargement, count the horizontal and vertical distances
to
one vertex on the original object
STEP 2:
Multiply the distances by the given scale factor
STEP 3:
Starting again from the centre of enlargement, measure the new distances and mark
the position on the grid of the corresponding vertex on the enlarged image