Posted by Convert angle in degrees to radiansConvert radians on .
90 degress= ? radians
How is the answer pie over 2?
330 degrees = 11pie over 6
105 degrees= 7pie over 12
Converting the angle in radians to degrees
3pie over 4 =135 degrees
pie over 2 = 90 degrees
pie over 30 = 6 degrees
7pie over 5 =135 degrees
I have these answers but I have no idea on how to get them..

algebra 
Henry,
180o = pi Radians.
Divide both sides by 2:
900 = p1/2 Radians.
OR
piRad/180Deg * 90Deg = 90pi/180=pi/2.
piRad/180Deg * 330Deg = 330pi/180=11pi/6