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May 25th, 2012, 02:07 AM   #1
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calculate the coordinates of the image P' of the point (3;5)

Calculate the coordinates of the image P' of the point (3;5) after a clockwise rotation about the origin through an angle of 210 degrees.
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May 25th, 2012, 03:23 AM   #2
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You posted that earlier. I replied here.
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May 25th, 2012, 03:36 AM   #3
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Re: calculate the coordinates of the image P' of the point (

o OK thank you I thought it was a reply to the glide reflection part. Thanks I got the answer but for future reference can you explain to me how to interpret which equation to use between the one you mentioned and (xcostheta + ysintheta; ycostheta-xsintheta)?
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May 25th, 2012, 03:38 AM   #4
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Re: calculate the coordinates of the image P' of the point (

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May 25th, 2012, 03:46 AM   #5
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Quote:
Originally Posted by joker91
. . . the one you mentioned . . .
What you gave corresponds to what I posted. What difference are you referring to? p' = Rp, where R is the rotation matrix, and p and p' are the (column) position vectors for the points P and P' respectively.
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May 25th, 2012, 03:49 AM   #6
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Re: calculate the coordinates of the image P' of the point (

Clockwise:

Counterclockwise:
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May 25th, 2012, 04:56 AM   #7
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Re: calculate the coordinates of the image P' of the point (

thank you greg1313 that cleared it up and thank you skipjack for the reply
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