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.
show equal sides. A square has equal sides and every angle is a right angle (90Â°). Also opposite sides are parallel. A square also fits the definition of a rectangle (all angles are 90Â°), and a rhombus (all sides are equal length).