# MAT - Paper 2012 - Q5

> Source: https://ollybritton.com/notes/maths/problems/mat/2012/q5/ · Updated: 2021-08-16 · Tags: mat, maths, notes

## Flashcards
##### What is the formula for $(x_n, y_n)$ rotated $90^{\circ}$ anticlockwise about the origin??
$$
(-y_n, x_n)
$$

##### What is the formula for $(x_n, y_n)$ rotated $90^{\circ}$ clockwise about the origin??
$$
(y_n, -x_n)
$$

##### If you have some intuitive feeling about some sort of transformation being a similar transformation applied more than once, how could you formalise it??
Using vectors.

---
Olly Britton — https://ollybritton.com. Machine-readable index: https://ollybritton.com/llms.txt