In geometry and algebra, a **radian** is an angle measurement on a circle, though, instead of using degrees, the length of the circle's radius is used to measure angles.

One radian is approximately 60°.

## Contents

## Conversions[edit | edit source]

**Degrees to Radians**[edit | edit source]

To convert from degrees to radians, multiply *d* degrees by π÷180.

E.g.

60° is equal to radians.

**Radians to Degrees**[edit | edit source]

To convert from radians to degrees, multiply *r* radians by 180÷π.

E.g.

**How Many Radians is a Circle?**[edit | edit source]

We know that a circle is 360°. Using our conversion methods to convert degrees into radians, we can figure this out.

Therefore, 360° is equal to 2π radians.

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