way for the first unification of China in 221 BC. the Zhou as the supreme political power in China. themselves considered this victory to be the beginning of their dynastic reign. The Zhou dynasty is subdivided into two periods: the Western and Eastern Zhou.
Adjacent angles are two angles that have a common vertex and a common side. The vertex of an angle is the endpoint of the rays that form the sides of the angle. When we say common vertex and common side, we mean that the vertex point and the side are shared by the two angles. Here's an example of adjacent angles: In this diagram, point A is the vertex of all of the angles shown.
A pair of angles that are adjacent to each other are next to each other. These two angles do not have to form any particular special angle; they just have to be next to each other. Going back to our labeled intersection, angles one and two are adjacent. So are two and three, three and four, and four and one.