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.
To find the degrees in a decagon, measure an angle. One angle is 144 degrees. Then, since there are 10 sides, multiply 144 with 10. Your answer would be 1440 degrees. Therefore, the degrees in a decagon is 1440 degrees.