# How do you find the angle A if you have tanA = 1.0?

$\tan \left(A\right) = 1.0$
is indicative of a standard triangle with a reference angle of $\frac{\pi}{4}$
If we limit ourselves to the range $\left[0 , 2 \pi\right)$
$\frac{\pi}{4}$
$5 \frac{\pi}{4}$