Here are the steps!

By using this formula;

**Converting from Radians to Degrees**

#"Radians" = pi/180^0 xx "Degrees"#

*or*

**Converting from Degrees to Radians**

#"Degrees" = 180^0/pi xx "Radians"#

**So from your question..**

Expressing #30^0# in Radians should be using this formula (**Converting from Degrees to Radians**)

#rArr 30^0# in Radians #-> "Degrees" = 180^0/pi xx "Radians"#

#color(white)(xxxxxxxiiixxxx)-> 30^0 = 180^0/(22/7) xx "Radians"#

#color(white)(xxxxxxxiiixxxx)-> 660/7 = 180/1 "Radians"#

#color(white)(xxxxxxxiiixxxx)-> 180 xx 7 color(white)(x)"Radians" = 660#

#color(white)(xxxxxxxiiixxxx)-> 1260color(white)(x)"Radians" = 660#

#color(white)(xxxxxxxiiixxxx)-> "Radians" = 660/1260#

#color(white)(xxxxxxxiiixxxx)-> "Radians" = 0.52 rad#