Before studying this section you need to have studied the **trigonometry** topic and also have studied how to calculate the **area of a sector**.

There are lots of technical names for the different parts of a circle that we need to know about. We have talked about some before. Which ones do you remember?

Today we will look at the **chord** of a circle and the **segment **of a circle, and how to calculate the length of a chord and the area of a segment.

**Worked Example**

AB is a chord of 12cm of a circle with centre O and radius 10 cm. Calculate:

- Angle AOB; and
- The area of the minor segment cut off by the chord AB.

**Exercise**

**Answers**