1. 14 inch 7 inch Which one contains more calories? a)They both contain the same amount b)Half the 14 inch pizza has more c)The full 7 inch pizza contains more

2. Arc Length and Sector Area LO: To be able to calculate the length of a circle arc. To be able to calculate the area of a circle sector.

3. Match up the parts of the circle with their terminology. Circumference Radius Sector Segment Arc Tangent Chord

4. Sector – part of a circle bounded by 2 radii.

5. Arc – a length of the circle’s circumference (the curved edge of a sector).

6. Starter What do you notice?

7. What is the area? 5cm 180° 8cm 90° 4cm 270°

8. Slightly harder… 10cm 225° In general… r ϴ°ϴ° AREA OF A SECTOR

9. What is the length of these arcs? 5cm 180° 8cm 90° 4cm 270°

10. Slightly harder… 10cm 225° In general… r ϴ°ϴ° LENGTH OF AN ARC

12. Reversing the formula to find the angle r ϴ°ϴ° LENGTH OF AN ARC 12cm ϴ°ϴ° 33.5cm