How do you calculate parallel radius on a sphere.

I have a wire frame sphere with a diameter of 96 units.  I need a math pro to show and explain the formula to calculate the diameter of the circle created by a parallel at a certain degree of latitude.  For your example please use 30 degrees.  If you find a web page that has a calculator for this on it, that would be good enough also.
Who is Participating?

[Webinar] Streamline your web hosting managementRegister Today

ozoConnect With a Mentor Commented:
Is the calculator at the following page you are looking for ("Calculate Circumference of the Earth at a given Latitude")?: >
pamsautoAuthor Commented:
That is using the correct formula I would assume (but it could be working with the fact the earth is not a sphere), but I need to input the diameter of my own sphere.
[Webinar] Kill tickets & tabs using PowerShell

Are you tired of cycling through the same browser tabs everyday to close the same repetitive tickets? In this webinar JumpCloud will show how you can leverage RESTful APIs to build your own PowerShell modules to kill tickets & tabs using the PowerShell command Invoke-RestMethod.

Assume perfect circle.

Formula: C = 2 pi r cos(x),

where pi = 3.14159..., r = the earth's equatorial radius = 6378 km, and x is the angle of latitude.
The formula: C ("diameter of the circle created by a parallel") = 2 pi r cos(x).

2 pi r = 96 in your case.

You can use the formula for all "degree of latitude" and "spheres" of all sizes.  :-)
C = Circumference = pi * Diameter
All Courses

From novice to tech pro — start learning today.