How many radians in a full circle?

How many radians are there in a full circle can be re-written as:

How many $57.296^@$ are there in a full circle?

$360^@/57.296^@=6.283$

Answer: $=6.283$

Another way that this can be expressed is

A radian is a radius that has travelled inside a circle which leaves an area of 57.296 degrees

Circumference $=2pir$

Circumference $=2pi$ radians (radius lengths)

Circumference $=2pi$ radians

NOTE:

1. The arc of a semi-circle would be ½ of this

? is a semi circle which is a little over 3 radians

2. A quarter of the arc of a circle would be a ¼ of $2pi$ radians

A half of a semi circle is ?/2 which is about 1.75 radians

In fact

Any part of a circle can be expressed in terms of radians (or parts of $57.269^@$ )