I assume you want to convert from degrees to radians. To convert from degrees to radians, you multiply by (pi / 180).
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It means a rotation of pi radians (180 degrees).
For 30 degrees arc the length = 30/360 x 2R x Pi = 1/12 x 20 x Pi = 5.236 units
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.
area = 225 pi = pi R squared/4 R = square root 900 = 30 in
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.