RADIANS

Convert a number from degrees to radians.

RADIANS(number)

The return type is a DOUBLE PRECISION number.

For example:
premdb=# select radians(1) from sys.const;
      radians       
--------------------
 0.0174532925199433
(1 row)
premdb=# select radians(avg_att) from team where avg_att>0 order by teamid;
      radians      
-------------------
  1.04622016681548
  0.58800142499689
 0.195284890005646
 0.724311639577647
 0.429979314521323
 0.665389324030318
 0.562013472434694
  0.76637407455071
 0.943193381070256
  1.31398858065645
 0.868371116037259
 0.470750205847911
 0.536706198280776
 0.480558956244119
 0.751730762126478
 0.361475141380546
 0.624408993193491
 0.359433106155712
 0.429892048058723
  0.60929444187122
(20 rows)