Conversation between radian and degree

1revolution=360°
1revolution=2π rad
  360°=2π rad
   π rad=180°
How to convert 90° into radian
    90°× (π rad /180°)🤔 why we multiply by "π rad /180°"? Because of multiplicative identity of 1 since π rad =180° so we are multiplying by 1
90°× (π rad /180°) = 90° (1) are equivalent
90°× (π rad /180°) = π/2 rad
Convert 3π/2 rad in degrees
To do that multiply by "180°/π rad
"
(3π/2 rad)(180°/π rad)

             270°