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anonymous
 one year ago
home work check FAN MEDAL AND TESTIMONIAL
An image point after a 180° rotation is Z'(3, 7). What were the coordinates of the preimage point?
Z(3, 7)
Z(7, 3) <
Z(7, 3)
Z(7, 3)
anonymous
 one year ago
home work check FAN MEDAL AND TESTIMONIAL An image point after a 180° rotation is Z'(3, 7). What were the coordinates of the preimage point? Z(3, 7) Z(7, 3) < Z(7, 3) Z(7, 3)

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Incorrect. If you're familiar with linear algebra and the rotation matrix (I think you should be, given this question), try it out. Apply the rotation matrix to the given vector and see what you get out. \[\left[\begin{matrix}\cos(180) & \sin(180) \\ \sin(180) & \cos(180) ?\end{matrix}\right]\left(\begin{matrix}7 \\ 3\end{matrix}\right) = ?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0To see the answer we want, we can rotate the point back to the original point. That is, we can take the image vector and rotate by 180 degrees. Note, these happen to be the same thing. Rotating by 180 is the same as rotating by 180.
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