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hugsandkisses

  • 4 years ago

When point E (-9, 3) is rotated 180� about the origin, its coordinate becomes (3, 9). True False

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  1. theabsurd
    • 4 years ago
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    false (-9, -3)

  2. hugsandkisses
    • 4 years ago
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    thanks hun!

  3. theabsurd
    • 4 years ago
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    your welcome

  4. shinigami1m
    • 4 years ago
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    how do you know its -9 -3?

  5. mathmate
    • 4 years ago
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    If you substitute the rotation matrix for 180 degrees, you'd get the rule T180(x,y)=(-x,-y), so the rotated point should be (9,-3)

  6. theabsurd
    • 4 years ago
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    ^know that, or you become a lazy slob like me who imagined it on the coordinate plane instead of remembering the rule. (Facepalm)

  7. mathmate
    • 4 years ago
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    You have a point. But to help someone, we need something concrete to work on.

  8. hugsandkisses
    • 4 years ago
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    thanks everyone!

  9. myininaya
    • 4 years ago
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    I see nothing wrong with imagining it on a coordinate plane. The rule makes more since that way.

  10. myininaya
    • 4 years ago
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    sense*

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