Joyner-Boore distance

Hello !

Here is given:

1. the strike angle of earthquake (Alpha)) in degrees,
2. the coordinates of the epicenter (Lan0,Lon0) ) in degrees,
3. the coordintes of the site (Lan1,Lon1) in degrees,
4. Sizes Proj. of Ruptured Area (L and W);

How can I find Joyner-Boore distance from the given site ?

[Image Analyst]

Plug them into the formula, which you have not provided.