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4 December, 07:40

Identify the coordinates of (3, - 9) after a rotation of 180° about the origin.

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  1. 4 December, 10:53
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    Answer: (-3,9)

    When we rotate 180 degrees about the origin, the rule is (x, y) - - > (-x,-y). The coordinate signs have swapped. If x is negative, then x turns positive, or vice versa. The same applies for y as well.

    x = 3 becomes - x = - 3

    y = - 9 becomes - y = - (-9) = 9
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