What's the room size? a floor plan of a flat i'm concidering to buy measures a...

a floor plan of a flat i'm concidering to buy measures a room 3m x 6m. however the room is not rectangular - the longer wall is cut diagonally, so one of the the ends is shorter than the other. does 3m states the length of the longer one or the shorter one or the middle of the room?
pls don't suggest asking the agent, they don't know and i can't landscape it yet.
Any Do-it-yourself Wall Decorative Ideas that give somebody...
Answers:    3m is approximately 9 foot and must be stand for average of two short sides .For example if one side is 2m and 50 cm other side is 3m and 50cm which tot all of short sides is 6m.
By dividing total of the to short sides you can find average of short side of the room.
What glue should be used to grip earthenware...
They largely indicate the longest measure.