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.
All quadrilaterals have 4 sides. A square has got 4 sides of equal length and 4 right angles (right angle = 90 degrees). A Rhombus has got 4 sides of equal length and opposite sides are parallel and angles are equal. The rectangle (oblong) contains 4 right angles (an angle of 90Ë).quare. A square has got 4 sides of equal length and 4 right angles (right angle = 90 degrees). Since ALL the angles in a quadrilateral add up to 360 then 360 divided by 4 must be 90.