A B
0000
0000
D C
[tex]\mathtt{Hi}\\\mathtt{This\.is\.formula=A+C=B+D}\\\mathtt{(-2,-1 )+(1,-4)=(-2,-4)+(\psi,\alpha)}\\\mathtt{-1,-5=(-2+\psi),(-4+\alpha)}\\\mathtt{-1=-2+\psi}\\\mathtt{1=\psi}\\\mathtt{-5=(-4+\alpha)}\\\mathtt{-1=\alpha}\\\mathtt{D(1,-1)}\\\mathtt{good day}[/tex]
