Adjacent angles must share a vertex , is a requirement of adjacent angles.
- Two angles are Adjacent when they have a common side and a common vertex.
Adjacent angles -
- The two angles are said to be adjacent angles when they share the common vertex and side.
- The endpoint of the rays, forming the sides of an angle, is called the vertex of an angle.
- Adjacent angles can be a complementary angle or supplementary angle when they share the common vertex and side.
- Supplementary adjacent angles always add up to 180. This is because the two angles sit next to each other on a straight line and all angles on a straight line add up to 180.
- However, if the adjacent angles are not linear pairs and another angle is in the mix, the two adjacent angles will not add up to 180.
Therefore, Adjacent angles must share a vertex.
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