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January 25th, 2015, 06:14 PM  #1 
Newbie Joined: Jan 2015 From: usa Posts: 1 Thanks: 0  Matrix Problem I am stumped on
Find the transformation for the triangle with the given vertices: D(8,15) E(7,4) F(4,10) moved right 3 and down 1, then reflected about the xaxis, then rotated 172 degrees counter clockwise. I know the answer, but I don't have any idea how to get it. Answer is D1 = (8.4, 15.4) E1 = (10.6, 3.6) F1 = (8.5, 9.9) Thanks!

January 25th, 2015, 07:38 PM  #2 
Member Joined: Jan 2015 From: Orlando, Florida Posts: 92 Thanks: 10 
first part is easy, add the x and y coordinates of each vertex by 3 and 1 respectively. now change the sign of the y coordinate of each vertex. finally, multiply each of the vertex (as a vector) by the rotational matrix arccos 172 arcsin 172 arcsin 172 arccos172 

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