Answer
$171.98^{\circ}$
Work Step by Step
We know that-
$1$ rad = $(\frac{180}{\pi})^{\circ}$
Therefore
$3$ rad = $(3\times\frac{180}{\pi})^{\circ}$
= $(3\times\frac{180}{3.14})^{\circ}$
= $(\frac{540}{3.14})^{\circ}$
= $171.98^{\circ}$