# Chapter 13: Circles and Cylinders

- Created by: safiarofidi
- Created on: 13-12-14 19:29

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- Circles and cylinders
- Circles
- Circumference
- 2?r
- ?d

- Area
- ?r²

- Circumference
- Sectors of circles
- Area of sector
- Where n is the angle of the sector

- Arc length
- n/360 2?R
- Where theta is the angle of the sector

- n/360 2?R
- Semicircle
- Perimeter
- ? x r + 2 x r

- Area

- Perimeter
- Quarter circle
- Area
- Perimeter
- 1/2 x ? x r + 2 x r

- Area

- Area of sector
- Cylinders
- Volume
- ?r²h
- volume = cross sectional area x height

- ?r²h
- Curved surface area
- 2?rh

- Surface area
- 2?r² + 2?rh
- 2 circles + curved surface area
- 2?r(r+h)

- Volume

- Circles

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