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2D Transformations

2D Transformations. To rotate a line or polygon, we must rotate each of its vertices. To rotate point (x 1 ,y 1 ) to point (x 2 ,y 2 ) we observe: From the illustration we know that: sin (A + B) = y 2 /r cos (A + B) = x 2 /r sin A = y 1 /r cos A = x 1 /r. y-axis. (x2,y2). (x1,y1).

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