1. The rays forming an angle are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite of the angle and the common point is called the  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite of the angle.

2. An angle whose measure is less than 90° is called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle.

3. An angle whose measure is exactly 90° is called a  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle.

4. An angle whose measure is exactly 180° is called a  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle.

5. An angles whose measure is greater than 180° and less than 360° is called a  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle.

6. Two angles are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle if their sum is 90°.

7. Two angles are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angles if their sum is 180°.

8. Angles which have a common vertex and a common arm, whose interiors do not overlap are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angles.

9. If the resultant angle is a straight angle then the angles are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angle.

10. When two lines intersect each other, two pair of non-adjacent angles formed are called  acuteadjacentarmscomplementaryreflexrightstraightsupplementaryvertexvertically opposite angles.