Incomplete transformation description
"The Missing Detail"
The Mistake in Action
Describe the transformation from shape A to shape B.
Wrong: "A rotation of 90°"
Why It Happens
Students correctly identify the transformation type but don't include all necessary details. Different transformations need different information.
The Fix
Each transformation needs specific information:
Reflection: the mirror line "Reflection in the line $y = 2$"
Rotation: centre, angle, AND direction "Rotation of 90° clockwise about (0, 0)"
Translation: the column vector "Translation by vector $\begin{pmatrix} 3 \\ -2 \end{pmatrix}$"
Enlargement: centre AND scale factor "Enlargement, scale factor 2, centre (1, 1)"
Memory aid: Think "What, Where, How much?"
Spot the Mistake
Can you identify where this student went wrong?
Describe the transformation
A rotation of 90°
Click on the line that contains the error.
Related Topics
Learn more about the underlying maths: