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To rotate a point (x, y) 90° clockwise, we can use the following formula:
x' = y
y' = -x
Applying this formula to the first endpoint (2, -1):
x1' = -1
y1' = -2
Similarly, applying the formula to the second endpoint (5, -4):
x2' = -4
y2' = -5
Therefore, the new endpoints after rotating the segment 90° clockwise are (-1, -2) and (-4, -5).