me 2 lazy tu du xtra werk & assume it be simpel rektangel
=stretched out square
rim-leng=2*(wide+hite)
=2*(2+4)=2*6=12
But that dont kount for the with av the trin...yu gotta kut diagonals at korners
weer horizontal ^ vertikal bords meet...
length...gotta add 2*how wide the trim be