The first thing to understand is what is the square of a sector. When buying calligraphy blank fans, we often see the introduction of 7-inch 18 square, 9-inch 18 square, 9-inch 20 square and 10 square. Inch is the length of the fan, and the square number is calculated according to the sum of the two big bones of the fan and the small fan bone in the middle. The picture below shows which lines can't be written and where leisure chapters should be reserved. When writing fans, we must first determine how many lines to write when signing, and then deduce how many lines the text can write.
9-inch 18 square sector, because the sector is wide at the top and narrow at the bottom, if the number of words in each row is the same, it will be very crowded at the bottom, and the layout will not look good and it will not be evenly distributed. Then the format can be arranged in this way, excluding the idle chapters and signature lines (the signature is calculated by three lines), and the text can be written as 13 lines. Take Wang Wei's Autumn Night in the Deep Mountains as an example, one line has four words, the next line has two words, and so on, so it is more convenient to calculate by two-line counting unit. Use it flexibly at the end, because the influence of the number of words may not meet the requirements of this format.