You said it. What is the actual room shape? What are the parameters that restrict your building, because you cut a few corners on this drawing?
15 ft long on inside wall to end of furnace. 12 ft to end of window on outside wall. 9feet wide . That is the space that I have. By the window noi the outsise wall the washer and dryer set. SO a diagonal cut from the edge of the furnace to the window edge is possible.