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.
Quadrilaterals have four sides and four interior angles which total 360 degrees. Each sub-type of quadrilateral has special properties that can differentiate it from the others: Rectangle: four right 90-degree angles and two pairs of parallel equal sides; Square: four right angles and four equal parallel sides