# How do you evaluate tan W = 19.0811?

Aug 9, 2016

W = tan^-1(1900811) = 86.99999 = 87.00°

#### Explanation:

The question being asked here is.
"Which angle, called W, has a tan value of 19.0811?"

The process of finding the angle from a known tan ratio is called arctan

This can be found from using tables, or on a calculator using the shift/alt/2nd function key and then the ${\tan}^{-} 1$ key.

Note that this does NOT mean $\frac{1}{\tan \theta}$

W = tan^-1(1900811) = 86.99999 = 87.00°