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Math Help - rotations

  1. #1
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    rotations

    hi,
    i need to describe the rotations for C and D from the clear triangle.

    rotations-shapes.jpg
    i have tried many way but i am unable to find out how to do this so i was looking for some help!

    thanks
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  2. #2
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    Quote Originally Posted by andyboy179 View Post
    hi,
    i need to describe the rotations for C and D from the clear triangle. <--- by construction or by the matrix?

    i have tried many way but i am unable to find out how to do this so i was looking for some help!

    thanks
    I've attached a sketch so you can see how the construction should be done:

    1. Connect corresponding original and image points.

    2. The perpendicular bisectors of these connections intersect at the center of the rotation.

    3. Connect the center of the rotation with corresponding original and image points and determine the angle of rotation.
    Attached Thumbnails Attached Thumbnails rotations-rotzentrumkonstrkt.png  
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  3. #3
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    i don't understand. on my other ones i have had answers like, "90 degrees anticlockwise at (0,0)"
    would C= 90degree clockwise at (1.5,0.5)?
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  4. #4
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    Quote Originally Posted by andyboy179 View Post
    hi,
    i need to describe the rotations for C and D from the clear triangle.
    i have tried many way <--- which ways? Why didn't you show us what you've done so far?
    but i am unable to find out how to do this so i was looking for some help!

    thanks
    I actually gave you "some" help. If it wasn't enough you should tell us where and why you got stuck.

    Quote Originally Posted by andyboy179 View Post
    i don't understand. on my other ones <--- ??? i have had answers like, "90 degrees anticlockwise at (0,0)"
    would C= 90degree clockwise at (1.5,0.5)?
    You don't expect me to present you a complete solution, do you?

    So once again: What didn't you understand, what did you do by yourself to find a (the) solution?
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