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.
A parallelogram is always a pushed over square. However a square implies 4 angles of 90 degrees (and 4 sides of equal length); a parallelogram has no angles that are 90 degrees, so really a parallelogram is never a square (even if the sides are all equal length).