Question

Point A' is the image of point A when point A is rotated about the origin B. What angle in the counterclockwise direction is
A rotated through?

Answer 1

9514 1404 393

Answer:

  90° CCW

Step-by-step explanation:

The slope of BA is -1/3. The slope of BA' is 3, so the slopes are opposite reciprocals of one another. These segments are perpendicular, meaning the angle between them is 90°.

Point A' has been rotated 90° CCW about point B.