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math

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i have a test coming up and i have no idea how to do rotations on a cartesian coordinate system. please help me!!

  • math -

    Let
    P=(x0,y0), original position of a point P
    P1=(x1, y1), position of P after rotation through an angle θ.

    P1=RP
    where
    R=rotation matrix in two dimensional space about the origin:
    cos(θ) sin(θ)
    -sin(θ) cos(θ)

    For more information, look up:
    http://en.wikipedia.org/wiki/Cartesian_coordinate_system

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