What are Angles?
- A figure formed from 2 rays which share a common endpoint is called Angle.
- The rays forming the angle are known as its arms or sides.
- The common endpoint is known as its vertex.
An angle is also associated with 3 parts
1. Interior -
- It refers to the inside/inner area.
- Point P lies in interior of the angle
2. Angle/boundary -
- It refers to the arms of the angle.
- Point B lies on the angle
3. Exterior -
- It refers to the outside / outer area.
- Point R and Q lies in exterior of the angle
Naming an Angle
- While naming an angle the letter depicting the vertex appears in the middle.
- An angle can also be named just by its vertex.
Example
The above angle can also be named as ∠BOA or ∠AOB or ∠B