[C320-list] Math problem

[LOCALJG at aol.com]

I am about to hang a Furuno Radar dish on my mast.  There is a  way to turn 
off the radar where the radar signal sweeps past the  mast. This small part 
of the radar's sweeping arch is called the "blanking  area."    So in order 
to find the amount of blanking area, I need  to do a math problem.  
Regrettably I am mathematically challenged and  wish to gain assistance from 
someone more inclined toward numerical  dexterity.  
 
Here is the challenge:  Think of this as a simple triangular  equation.  
Two legs of the triangle are 14.5 inches long.  The  base of the triangle is 
5.5 inches long.  I need to know the angle  in degrees of the apex of the 
triangle.  
 
The 14.5 inch legs are being measured from the center of the  Radar dish to 
the sides of the main mast.  The distance of 5.5 inches  is the distance 
between the two 14.5 inch legs of the triangle at the  mast.  The blanking 
area of the radar will be around 6 degrees. I will set  this in the radar when 
I program it following installation.  
 
Thanks for the help. 
 
John G. 
1996 #329