Respuesta :

#1

Use trigonometry to find defraction angle

  • B=25
  • H=50

So

  • cosA=B/H
  • cosA=25/50
  • cosA=1/2
  • A=cos^{-1}(1/2)
  • A=π/3 or 60°

#2

  • In radians it's π/3
  • In degrees it's 60°