(This means : You have an angle A, you divide Angle A into 3 Angles B,C,D. And B=C=D=A/3)
Note: vohonam clarified that the problem actually only gives you a straightedge, not a ruler.
While it can be solved given a precise ruler with the use of trigonometry, no solution has yet been found with just a straightedge.
flooble's webmaster puzzle