Radians are not measured in Pi, they are just a number. A radian is defined as the ratio between the length of a circular arc and the radius of the circle. For example if the arc goes around 360 degrees (a full circle), the radians are 2PiR divided by R. So 360 degrees is 2 Pi radians.

How many radians are there in a circle without pi?

It's actually fairly simple. The circumference of a circle is 2 times π times r which means that there are approximately 6.28 Radians in a full circle.

Is a radian 180 pi?

It follows that the magnitude in radians of one complete revolution (360 degrees) is the length of the entire circumference divided by the radius, or 2πr / r, or 2π. Thus 2π radians is equal to 360 degrees, meaning that one radian is equal to 180/π ≈ 57.295779513082320876 degrees.