janguera Posts: 7, Reputation: 1 New Member #1 Jan 25, 2006, 12:51 PM
How do I rotate a 2D triangle around its center of mass?
Hello!
I'm trying to figure out how to calculate the resultant polar coordinates of a triangle following the triangle's 45 degree rotation about it's own center of mass. I've seen how to rotate the triangle using:

In 2D, you make (X,Y) from (x,y) with a rotation by angle t so:
X = x cos t - y sin t
Y = x sin t + y cos t

... but this only rotates the triangle with regards to the background. I want to figure out a way to find the NEW polar coordinates of the triangle after a 45 degree rotation. Any and all suggestions/comments are welcome!

Joaquin

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