From this picture you can calculate coordinates of triangles' vertices:
[tex]A(-9,0),\ B(-6,-4),\ C(-3,0),\ J(8,0),\ G(5,4),\ H(2,0) [/tex].
Since
[tex] \frac{-9+8}{2} = \frac{-6+5}{2}= \frac{-3+2}{2}=- \frac{1}{2} [/tex] [tex]\frac{0+0}{2}= \frac{-4+4}{2} = \frac{0+0}{2} =0[/tex]
you can conclude that points A, B, C are rotated by [tex]180^0[/tex] about the point (-0.5,0) to form points J, G, H, respectively.
Answer: A is correct choice.
