Enlargement Flashcards
What is the start image called in enlargement?
The object
What is the enlarged image called in enlargement?
Image
How can we tell what the image is in enlargement?
It has dashes next to the letters of the points
How do we enlarge?
Square lengths by scale factor to enlarge
How can we work out the scale factor?
Divide one edge of image by same edge in object
What does enlargement not effect?
The size of angles
What does enlargement produce?
Similar shapes
What is the rule for similar shapes?
In similar shapes angles are the same but length of lines have all changed
How do you enlarge an object using a point if enlargement?
Draw lines from the centre of enlargement to all points of the shape
What does enlarging by a negative scale factor do to the produced image?
The image produced when you enlarge a shape by a negative scale factor is a rotation of the enlarged object, 180* in the centre of enlargement
What does enlarging by a positive scale factor do to the produced image?
Enlarging by a positive scale factor makes the image grow bigger and further away from the centre of enlargement
What happens when the centre of enlargement is on the shape?
The image will overlap the object
When the scale factor is negative and the centre of enlargement is on the shape what happens to the image?
The shape rotates but one point remains attached to the object
What is always the same in both the object and the image?
The angles
A
|. \
B |. \
|\_\_\_5cm\ C
|. \
B'|_ \_\_\_\_\_\_\_\_\_\_\_\_\_\C'
15cm
What is The scale factor?
B C. =3
SF: 3
