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^(''))`

Explanation

To solve the problem of converting angles from degrees, minutes, and seconds to radians, we will follow a systematic approach using the given relationships.

### Step-by-step Solution:

**(i) Calculate 1 degree in radians:**

1. We know from the problem statement that:
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