I have a game plan . . .
We have four unknowns; we will need four equations.Code:(2,5,17) ♥ C * * D * * (xd,yd,13) ♥ * * * * * * ♥ (xb,yb,13) * * B * * A ♥ (13,30,9)
The sides of the square are equal.
These give us three equations.
The diagonals are equal.
This gives us the fourth equation.
Can you take it from here?