Calulate the angle of 1" (secondof arc or arc sec) in radian. (Use `360^(@)=2pi` rad, `1^(@)=60'and1'=60`")

Options

A. `4.85xx10^(-6)`rad
B. `4.85xx10^(6)`rad
C. `4.85xx10^(5)`rad
D. `4.85xx10^(-5)`rad

Answer

A

Explanation

1"`=1` are sec`=(1')/(60)=(1^(@))/(60xx60)`
`=(1)/(60xx60)xx(pi)/(180)rad`
`=4.85xx10^(-6)`rad