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.
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. In this instance, the sum of the interior angles of a decagon is equal to 180 â¦ x (10 - 2) = 1440 degrees. (10-2)*180 = 8*180 = 1440 degrees.