**Category : **4th Class

Inclination between two rays having common end point is called angle.

In the above picture, OP and OR are two rays which have a common end point 0. The inclination between the rays OP and OR is called angle POR and it is denoted as . Point O is called vertex and rays OP and OR are called arms of the angle POR.

**Features of an Angle**

- Angles is measured in degree.
- Symbol of the degree is "°".
- Measure of an angle is written as a° where a is a number. Ex: 45 degree is written as 45°.

**Types of Angles**

Angles have been classified into following groups based on their measurement.

- Acute angle
- Right angle
- Obtuse angle

**Acute Angle**

An angle which is greater than 0° and smaller than 90° is called acute angle

**Right Angle**

An angle of exactly 90° is called right angle .

**Obtuse Angle**

An angle which is greater than 90° and smaller than 180° is called obtuse angle

*play_arrow*Triangle*play_arrow*Angle*play_arrow*Quadrilateral*play_arrow*Circle*play_arrow*Introduction

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