10) Transformations Flashcards
What can you use a column vector to describe?
A transformation.
What do you need to give to describe fully a reflection on a coordinate grid?
Equation of mirror line.
How do you rotate a shape?
Turning it around a point called centre of rotation.
What is the centre of rotation?
The point around which a shape is rotated.
How do you describe fully a rotation?
Give angle, direction + centre of rotation.
What do you need to do to enlarge a shape?
Multiply all side lengths by same number.
What is the number the side lengths are all multiplied by called?
Scale factor.
What do you do when you enlarge a shape using a centre of enlargement?
Multiply distance from centre to each vertex by scale factor.