No coords given in question. Let the following apply: A(a(x),a(y)), B(b(x),b(y)), C(c(x),c(y)).
A(a(x),a(y))➝A(a(x)-1,a(y)-2)➝A'(a(y)-2,1-a(x))
B(b(x),b(y))➝B(b(x)-1,b(y)-2)➝B'(b(y)-2,1-b(x))
C(c(x),c(y))➝C(c(x)-1,c(y)-2)➝C'(c(y)-2,1-c(x))
EXAMPLE
A(-4,5), B(5,2), C(-3,-3)➝A'(3,5), B'(0,-4), C'(-5,4)
The diagram uses the coords in the example. Track the translation and rotation of each vertex. The blue points show the results of translation and the 90° arcs show the rotation to the final position.