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# FM Perimeter

## 2.1 Circles and Arcs

### Circle

• The set of all points in the plane that are a fixed distance (the radius, r) from a fixed point (the centre, O).
• The angle at the centre of a circle is 360°.

### Diameter (D)

• A chord passing through the centre.
• D = 2r, twice the length of the radius.

### Circumference of a Circle

• The circumference of a circle, AKA the perimeter, is given by:

c=2 \pi r

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