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.
In addition to the 90-degree and 45-degree angles so simple to scribe from an angle, you can also use a speed square to set any other angle between zero degrees and 80 degrees. A home remodeling expert demonstrates in this free video of professional home help tips.