Calculate the angle of (a)$1^o$(degree) (b)$1^{\prime }$ (minute of arc or arcmin) and (c)$1^{\prime \prime }$(second of arc of arc second) in radians.
Use ${360}^o=2\pi rad$, $1^o={60}^{\prime }$ and $1^{\prime }={60}^{\prime \prime }$

Q. Calculate the angle of $1"$ (second of arc or arc second) in radians.
Use ${360}^o=2\pi$ rad $1^o={60}^{\prime }$ and $1^{\prime }={60}^{\prime }$

Q. Calculate the angle of $1^{\prime }$ (minute of arc or arcmin)

Q. Calculate the angle 1''(second of arc or arc of second) in radians.
please explain it a little elaborately

Q. In a circle, the major arc is 3 times the minor arc. The corresponding central angles and the degree measures of two arcs are

(a) 90° and 270°

(b) 90° and 90°

(c) 270° and 90°

(d) 60° and 210°