**1 MEASUREMENT OF ANGLES**

There are two systems used for the measurement of angles.

**Sexagesimal system:**

Here a right angle is divided into 90 equal parts known as **degrees**. Each degree is divided into 60 equal parts called **minutes** and each minute is further divided into 60 equal parts called **seconds.**

60 seconds (or 60”) = 1 minute (or 1’)

60 minutes (or 60) = 1 degree (or 1°)

90 degrees (or 90°) = 1 right angle

**Circular Measurement:**

In this system a unit called **‘Radian’** is defined as follows:

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