Written records of the history of China date from as early as 1500 BC, from the Shang dynasty (c. 1600â1046 BC). Ancient historical texts such as the Records of the Grand Historian (c. 100 BC) and the Bamboo Annals (296 BC) describe a Xia dynasty (c. 2070â1600 BC) before the Shang, but no writing on a durable medium have survived.
A square is a quadrilateral so it has 360 degrees. A square is a quadrilateral so it has 360 degrees.
One Methods: Using the 3-4-5 Rule. One of the challenges when creating corners is getting them square. While your room doesn't need to be perfectly square, it's best to get corners as close to 90 degrees as possible. If not, any tile or carpet laid will be noticeably 'off' from one side of the room to the other.