Calculate the angle of
(i) `1^(@)` (degree)
(ii) `1^(@)` (minute of arc or arc minute) and
(iii) `1^(@)` (second of arc or arc sec)
in radian.(Use `360^(@)=2pi rad`,`1^(@) = 60^(@)` and `1^(')=60^(@)` and `1^(')=60^(''))`