Classification of angles on the basis of their degree measures are given below:

**Acute Angle:**

An angle whose measure is more than 0° but less than 90° is called an acute angle. Angles having magnitudes 30°, 40°, 60° are all acute angles. In the adjoining figure, ∠X0Y represents an acute angle.

∠X0Y < 90°

**Right Angle: **

An angle whose measure is equal to 90° is called a right angle. In the adjoining figure ∠ABC represents a right angle.

∠ABC = 90°

**Obtuse Angle: **

An angle whose measure is more than 90° but less than 180° is called an obtuse angle. In the adjoining figure, ∠XYZ represents an obtuse angle.

∠XYZ > 90°

∠XYZ < 180°

**Straight Angle: **

An angle whose measure is equal to 180° is called a straight angle. In the adjoining figure, ∠XOY represents a straight angle.

∠XOY = 180°

**Reflex Angle: **

An angle whose measure is more than 180° but less than 360° is called a reflex angle. In the adjoining figure, ∠POQ is a reflex angle. Angles having magnitudes 220°, 250°, 310° are all reflex angles.

∠POQ > 180°

∠POQ < 360°

**Complete Angle: **

An angle whose measure is equal to 360° is called a complete angle. In the adjoining figure, ∠BOA represents a complete angle.

60 minutes = 1 revolution = 1 complete angle.

These are the adjoining figures of the classification of angles on the basis of their degree measures.

●** Lines and Angles**

**Fundamental Geometrical Concepts**

**Some Geometric Terms and Results**

**Complementary and Supplementary Angles**

**Parallel and Transversal Lines**

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