Answer
$194.90^{\circ}$
Work Step by Step
We know that-
$1$ rad = $(\frac{180}{\pi})^{\circ}$
Therefore
$3.4$ rad = $(3.4\times\frac{180}{\pi})^{\circ}$
= $(3.4\times\frac{180}{3.14})^{\circ}$
= $(\frac{612}{3.14})^{\circ}$
= $194.90^{\circ}$