unit 8

• What are the three key points to plan a shape?

  Side, front, and number
• What are reflection and rotations classified as?

  Types of transformation
• What do transformations do to a shape?

  Move it to a different position
• What are the three components to describe a rotation?

  Direction of turn, angle of turn, centre of rotation
• What is an enlargement in terms of transformation?

  All side lengths are multiplied by a scale factor
• What two components describe an enlargement?

  Centre of enlargement and scale factor
• How does the area change when a shape is enlarged by a factor of x?

  Area is enlarged by $x^2$
• What should you do when a centre of enlargement is given?

  Multiply distance from centre by scale factor
• What effect does a negative scale factor have on an image?

  Takes the image to the opposite side
• How do all points move in a translation?

  Same distance in the same direction
• How is a translation described mathematically?

  Using a column vector
• What is the resultant vector?

  Vector that moves the original shape
• What does it mean to construct in geometry?

  To draw accurately
• What does a perpendicular bisector do?

  Cuts a line in half at right angles
• What is the shortest path from a point to a line?

  Its perpendicular to the line
• What does an angle bisector do?

  Cuts an angle directly in half
• What is a locus in geometry?

  Set of all points obeying a rule
• Where do points equidistant from two points lie?

  On the perpendicular bisector of the line
• Where do points equidistant from two lines lie?

  On the angle bisector