# Answer on Geometry Question for Dan

Question #10461

If i know the chord length and number of holes in a bolt circle how can i calculate the bolt circle diameter?

Thanks, Dan

Thanks, Dan

Expert's answer

Let's calculate the chord length: s = 2r tan(π/n), where r is radius

and n is

the number of holes.

So, d = 2r = s / tan(π/n).

and n is

the number of holes.

So, d = 2r = s / tan(π/n).

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