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anonymous

  • one year ago

What is the difference between rotation about the origin and rotation about the center of the figure?

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  1. LynFran
    • one year ago
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    rotation about the origin is the point (0,0) and rotation about the center is any point(x,y)

  2. LynFran
    • one year ago
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    for the origin x=0 & y-=0

  3. LynFran
    • one year ago
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    for the center x can equal any value also y...example (2,9) x=2 y=9

  4. anonymous
    • one year ago
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    So this would be about the center?

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  5. anonymous
    • one year ago
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    @LynFran

  6. LynFran
    • one year ago
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    ok what exactly is the question i find that for the point H with H' and F with F' \[\left[\begin{matrix}1 & 0 \\ 0 & -1\end{matrix}\right]\] ...what i would also like to know if the topic is matrices

  7. anonymous
    • one year ago
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    Here is the full question: Carlos performed a transformation on trapezoid EFGH to create E'F'G'H', as shown in the figure below: [insert picture i posted before] What transformation did Carlos perform to create E'F'G'H'? and the answer choices are: A. Rotation of 90 degrees counterclockwise about the origin B. Rotation of 90 degrees counterclockwise about the center of the figure C. Rotation of 90 degrees clockwise about the origin D. Rotation of 90 degrees clockwise about the center of the figure

  8. anonymous
    • one year ago
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    @LynFran So I assume that it would be 90 degrees clockwise, correct? But I'm not sure if it is about the origin or about the center.

  9. Loser66
    • one year ago
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    |dw:1435026349286:dw|

  10. Loser66
    • one year ago
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    to go from F to F' , you need go on which direction to get 90 degree? |dw:1435026460507:dw|

  11. anonymous
    • one year ago
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    counter clockwise

  12. Loser66
    • one year ago
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    yup, but you got what it means, right?

  13. anonymous
    • one year ago
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    Yeah I understand that part now. I just dont understand what it is rotating "about"

  14. Loser66
    • one year ago
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    you have 90 degree, right? and 2 options: about origin and about center of the figure, right? if about origin, that is : all vertices of the original one perpendicular with the corresponding vertices of the new one through origin. Like what I draw, FO \(\perp\) F'O

  15. Loser66
    • one year ago
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    if you link AO and A'O, you can see they form a 90 degree also.

  16. Loser66
    • one year ago
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    If about center of the figure, first off, you have to find that center, then, link the vertices like what you did with O. Dat sit

  17. anonymous
    • one year ago
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    So then it would be about the center of the figure?

  18. Loser66
    • one year ago
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    |dw:1435026925440:dw|

  19. Loser66
    • one year ago
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    Nope, your problem is about origin

  20. anonymous
    • one year ago
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    Oh I think I understand

  21. anonymous
    • one year ago
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    Thank you

  22. Loser66
    • one year ago
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    ok

  23. anonymous
    • one year ago
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    Wait a second I just entered that answer (A) and it said it was wrong

  24. Loser66
    • one year ago
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    http://www.regentsprep.org/regents/math/geometry/gt4/rotate.htm

  25. Loser66
    • one year ago
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    http://www.onlinemathlearning.com/rotation-transformation.htm I don't know why it said wrong. :(

  26. anonymous
    • one year ago
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    basically if you turn it around the origin the position of the shape and position of the shape on the grid would change but if you turn it on its center it just changes the position of the shape

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