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anonymous

  • 4 years ago

Find the coordinates of the image of a triangle with vertices : A(0,-4), B(9,0), and C(-5,2) for a rotation of 90 degrees counterclockwise about the origin.

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  1. amistre64
    • 4 years ago
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    swap x for y and negate

  2. cwrw238
    • 4 years ago
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    A(4,0), B(0.9), C(-2,-5)

  3. amistre64
    • 4 years ago
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    (0,-4) = (--4,0) (9,0) = (0,-9) (-5,2) = (-2,--5)

  4. amistre64
    • 4 years ago
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    c might be off, -5,2 is down 5 and right 2; 2,-5

  5. Hero
    • 4 years ago
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    amistre, is "swap x and y and negate" the general method?

  6. cwrw238
    • 4 years ago
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    how can it be (0, -9) ??

  7. amistre64
    • 4 years ago
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    |dw:1327872649211:dw|

  8. amistre64
    • 4 years ago
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    im thinking it is general in me head

  9. anonymous
    • 4 years ago
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    ok i understand that thank you!!

  10. amistre64
    • 4 years ago
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    might need to be tweeked with quadrants tho :)

  11. amistre64
    • 4 years ago
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    (9,0) would be (-0,9)

  12. amistre64
    • 4 years ago
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    so yeah, it works for me :) as long as i dont typo meself lol

  13. anonymous
    • 4 years ago
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    amistre when u get a sec jump on mine for me?

  14. cwrw238
    • 4 years ago
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    |dw:1327872730598:dw|

  15. amistre64
    • 4 years ago
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    right, I negated the wrong one; in general id say: (x,y) flips tp (-y,x)

  16. cwrw238
    • 4 years ago
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    yep

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