Step 1 :The given triangle is represented by a 2x3 matrix: \[\begin{array}{ccc} 3 & 6 & 3 \\ -3 & 3 & 3 \end{array}\]
Step 2 :We are asked to rotate this triangle 270 degrees counter-clockwise about the origin. The rotation matrix for a 270 degrees counter-clockwise rotation is: \[\begin{array}{cc} 0 & 1 \\ -1 & 0 \end{array}\]
Step 3 :To find the new coordinates of the triangle, we multiply the given matrix by the rotation matrix.
Step 4 :The result of this multiplication is: \[\begin{array}{ccc} -3 & 3 & 3 \\ -3 & -6 & -3 \end{array}\]
Step 5 :\(\boxed{\text{Final Answer: The coordinates of the triangle after a 270 degrees counter-clockwise rotation about the origin are (-3, 3, 3) and (-3, -6, -3).}}\)