Matters needing attention in hanging Kungua supplementary education card

Precautions for hanging Kun Gua's corner board: On the floor plan, draw a complete rectangle along the outer contour line of the house floor plan. Usually, when the missing part reaches half or more of the wall surface of an adjacent building, it can be defined as missing corner here, and if the missing part is less than half of the wall surface of an adjacent building, it can be ignored.