The first transformation:
A(-4,2) => A'(-4+3,2-2) = A'(-1,0)
B(-3,-1) => B'(-3+3,-1-2) = B'(0,-3)
C(-1,-1) => C'(-1+3,-1-2) = C'(2,-3)
A rotation of 180° around the origin can be written as follow:
T(x,y) = (-x,-y)
A'(-1,0) => A''(1,0)
B'(0,-3) => B''(0,3)
C'(2,-3) => C''(-2,3)
