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 formula for calculating degrees of any polygon is: 180(n-2) where n is the number of sides a decagon has 10 sides so it is: 180(10-2) The answer is 1440 degrees. You mean, how many degrees in one of the interior angles? Assuming this is a regular decagon, you can break it up into 10 isocelese triangles with 180/10 = 18 degrees in one angle, with the other two angles adding up to 180 - 2*18 = 144 degrees.