Remember the following formulae:

Area of sector = x r^{2} x /360

Area of triangle = ½ a b sinC

We use these formulae to find the area of a segment.

**Example**

If R = 20 cm and = 60º,

the area of the sector = x 20 x 20 x 60 ÷ 360 = 209.44

the area of the triangle = ½ x 20 x 20 x sin 60º = 173.21

So the area of the segment = 209.44 - 173.21 = **36.23 cm ^{2}**

*Give all answers to 2 decimal places in this worksheet.*