### Rotating by 90 ° in a clockwise direction about the origin

We see:

$$A(4, 4) \rightarrow A^\prime (4, −4); B(3, 6) \rightarrow B^\prime (6, −3); C(5, 7) \rightarrow C'(7, −5)$$.

In general, $$P(x, y) \rightarrow P^\prime (y, − x)$$.