Question

does anyone know how to do the attached? I have literally spend 2 days on it and no luck ):

Answer 1

@sourwing

Answer 2

Cannot see diagram clearly. General suggestion: try to get this into a two-dimensional problem and then use trig.

Answer 3

@douglaswinslowcooper is this better? i tried making it 2d but it is really difficult D:

Answer 4

hope this will help somewhat
tan35° = (sr)/(pr)
tan 40° = (sr)/(qr)
(sq)^2 + (20)^2 = (ps)^2
(pr)^2 + (sr)^2 = (ps)^2
angle pqr = 90°

Answer 5

@triciaal thanks! i have solve it!

Answer 6

Congratulations!