01-21-2014, 10:38 AM
Thanks for a great posting Tom.
It might be worth pointing out that the math requires that the angle between CH and CL is a solid 90 degrees. (The trig functions used here assume that this angle is 90 deg).
Another clarification for those that don't work with a lot of trig:
Tan A/2 is to be taken as Tan (A/2) not (Tan A)/2. In other words, Tan of 1/2 the angle, not 1/2 the Tan of A. (gives two different results)
Not to worry, if you do it wrong it will be obvious because the result will be way out of line.
Terry S.
It might be worth pointing out that the math requires that the angle between CH and CL is a solid 90 degrees. (The trig functions used here assume that this angle is 90 deg).
Another clarification for those that don't work with a lot of trig:
Tan A/2 is to be taken as Tan (A/2) not (Tan A)/2. In other words, Tan of 1/2 the angle, not 1/2 the Tan of A. (gives two different results)
Not to worry, if you do it wrong it will be obvious because the result will be way out of line.
Terry S.