Trigonometry Bolt help

[Zombot]

Ok I dont know where to place the information given..and i had to replicate the picture that this question is because its from my book.

The question states Find the diameter of the bolt circle in the picture below if the bolt distance is 8 cm and the angle formed by the diameter and the bolt distance is 72 degrees.

Now my issue is...i have no idea where to place the information correctly..and I am confident i can solve this if i could place it right.

 

[tkhunny]

\(\displaystyle \tan(72 deg) = \frac{Bolt}{E}\)

\(\displaystyle \sin(72 deg) = \frac{Bolt}{Diameter}\)

\(\displaystyle \cos(72 deg) = \frac{E}{Diameter}\)