About two o'clock. The size of B5 paper is 18.2cm×25.7cm, and the size of 8K paper (No.8 paper) is 26cm×37cm. Divide the size of No.8 paper by the size of B5 paper, which is about 2, so it is about 2. Octagonal paper, also known as octagonal paper, is a common paper specification and is often used to print books, magazines, newspapers and other publications. The size of B5 paper is relatively small, and it is often used to make books, notebooks, paper and student paper in schools.