You have a figure with the following points:
(-4 , 4) (-4 , 1) (0 , 1)
In order to rotate the previous figure 180°, you tajke into account that a rotation like this, makes the following transformation:
R(x , y) = > (-x , -y)
Then, for each of the given points you have:
R(-4,4) => (-(-4), -4) = (4,-4)
R(-4)