TMSCA #13 - Problem 36

[adub427]

I'm not sure how to work problem 36 from this past Calculator test. Can anyone steer me in the right direction? Thanks.

A "4-40" bolt has an outer diameter of 0.112 inches with 40 threads per inch. The short leg of a paper right triangle is aligned along the axis of a 4-40 bolt and is then wrapped around the bolt multiple times. If the triangle hypotenuse follows exactly the major thread diameter, what is the smaller acute angle of the triangle? Correct Answer: 4.06

[AuSmith]

You can suppose the bolt is 4 inches long. You could suppose it is 1 inch long. The length doesn't matter because the information given already describes the slope of the thread.

[adub427]

I've got it now! Thanks!