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.
there are exactly 180 degrees in a triangle, no matter if it is an obtuse, acute or right triangle. The some of all the angles in a triangle will always be 180 degrees. Of course, there are exceptions to this. The angles of a triangle are 180 degrees only when drawn on a plane. If you were to draw a triangle on a curve surface, then the angles wouldn't add up to 180 degrees. Take for example, Earth.