Calculate the area of quadrilateral

According to local conditions, Beijing quadrangles have no fixed size, only general principles.

What you drew is a three-dimensional diagram, which is drawn according to the general principles of Beijing standard quadrangles: the basic shape is the north room (main room), the south room (inverted room) and the east and west rooms, surrounded by high walls, with a gate in the southeast corner.

The total number of rooms is 5 rooms in the North House, 3 rooms in the East House, 3 rooms in the West House, each with one ear, 6 rooms in the South House with gatekeepers, and 22 rooms with hanging doors. Generally, the principal room 15- 18 square meters, the wing room1-12 square meters, and the wing room is smaller. The total area of the house is about 240 square meters, covering an area of about 450 square meters. Generally, it is a rectangular area of18x25m.

If it is a quadrilateral with two entrances, three entrances or even larger, the area will be even larger. Two entrances shall not be less than 600 square meters and three entrances shall not be less than 900 square meters. Of course, this still refers to the general standard.