You can put this solution on YOUR website! In equilateral
angle p+ angle q+angle r+ angle s=360
p+q+r+s=360
p=3q
r=4s
s=q
so r=4q
3q+q+4q+q=360
9q=360
q=360/9
q=40
p=3*40
= 120
r=4*40
=160
s=q=40
Result : angle p=120
angle q=40
angle r =160
angle s=40