pi is not equl to 180 degree but it is often simplified as 22/7, it is used to calculate area of circles,etc A circle is 360 degree
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There is no word such as raduis. The nearest word that makes the question sensible is radians. To convert degrees to radians you multiply by pi/180. That is,d degrees = d*(pi/180) radians.
A whole circle is 360 degrees or 2*pi radians. 360 degrees = 2*pi radians so that 1 degree = pi/180 radians This gives the conversion factor of pi/180 to convert degrees to radians.
If you are meaning it in sense of a geometry, the it's 3 * 180 degrees (which is what they mean by pi) = 540 degrees.
I assume you want to convert from degrees to radians. To convert from degrees to radians, you multiply by (pi / 180).
To get radian measure of angle given in degrees, multiple the measure in degrees by PI/180. Example: 60 deg = 60 * PI/180 rad = 1.047 rad.