Question

Hello! I’m stuck on a geometry question relating to transformations. If I have to “write a rule” for a rotation, does this mean I have to say what type of rotation a graph shows (for example 90 degree clockwise rotation) or can I just write how the x and y of each point of a shape change (example: A(x,y)➡️(-y,x) and so forth for every point). Thank you so much!

Answer 1

Writing a rule for a rotation implies that you provide the notation for the rule. e.g (x, y) ⇒ (−y,x)

Writing a rule for a rotation

When you are asked to "write a rule" for a rotation in geometry, it usually means expressing how each point in the shape moves during the rotation.

This means that you have to provide the notation for the rule.

Take for instance:

For a 90-degree clockwise rotation, each point (x,y) is transformed to (−y,x)

So, the rule of the rotation is (x, y) ⇒ (−y,x)