1. SUBTOPIC 8.3: AREA OF SECTOR OF A CIRCLE CHAPTER 8: CIRCULAR MEASURE

2. The net of a cone consists of a circle and a sector.

3. Area of sector OPQR Area of circle AREA OF A SECTOR The area of a sector, A is proportional to the angle subtended at the centre of the circle. θ rad Q

4. Therefore, The area of sector of a circle is; When using the formula , remember that the angle θ is measured in radians.

6. Solution Area of the shaded sector

8. Solution Area of the shaded sector 120º = 2.094 rad

10. Solution Area of the sector

11. WORKSHEET

14. SUMMARY Circular Measure Л rad = 180º Area of sector, A θ