How to sharpen a head knife

[Northmount]

Tan(20) = 0.364

https://researchmaniacs.com/Math/Tangent/Degrees/What-is-Tan-20-Degrees.html

And a tangent calculator https://www.rapidtables.com/calc/math/Tan_Calculator.html

You can find all this kind of stuff on the web these days.  Don't have to go digging for your old Math Tables from 60 years ago if you have access to a computer/phone/tablet and an internet connection.  Chances are there is a calculator on your smart phone that will tell you too if you select scientific mode!

Tom

 

[Art]

.364

CRC Standard Math Tables.