Which rotation about the origin?
Compare the coordinates. 180°: both signs change. 90° clockwise: (x, y) goes to (y, −x). 90° counterclockwise: (x, y) goes to (−y, x).
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A point is rotated about the origin from (4, 3) to (3, −4). Which rotation was it? Write 90cw, 90ccw or 180.
Answer: 90cw
A point is rotated about the origin from (4, −1) to (−1, −4). Which rotation was it? Write 90cw, 90ccw or 180.
Answer: 90cw
A point is rotated about the origin from (−7, 5) to (5, 7). Which rotation was it? Write 90cw, 90ccw or 180.
Answer: 90cw
Tip: Compare the coordinates. 180°: both signs change. 90° clockwise: (x, y) goes to (y, −x). 90° counterclockwise: (x, y) goes to (−y, x).
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