How many radian in 1 1/4 circle?
The answer is 1.57079632679.

We assume you are converting between **radian** and **1/4 circle**.

You can view more details on each measurement unit:

radian or
1/4 circle

The SI derived unit for **angle** is the radian.

1 radian is equal to 0.636619772368 1/4 circle.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between radians and 1/4 circle.

Type in your own numbers in the form to convert the units!

In mathematics and physics, the radian is a unit of angle measure. It is the SI derived unit of angle. It is defined as the angle subtended at the center of a circle by an arc of circumference equal in length to the radius of the circle. Angle measures in radians are often given without any explicit unit. When a unit is given, sometimes the abbreviation rad is used, sometimes the symbol c (for "circular").

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