To find the coordinates of a point \( C' \) after a \( -90^\circ \) (clockwise) rotation about the origin, we can use the rotation transformation formulas.
For a point \( (x, y) \), the coordinates after a \( -90^\circ \) rotation are given by:
\[ (x', y') = (y, -x) \]
If you have the original coordinates of point \( C \) (let's denote it as \( (x, y) \)), apply this transformation to find \( C' \).
For example:
- If \( C = (2, 3) \), then:
- \( C' = (3, -2) \)
Please provide the original coordinates of point \( C\) if you need a specific answer for \( C' \).