Answer
-$24^{\circ}$
Work Step by Step
We know that-
$1$ rad = $(\frac{180}{\pi})^{\circ}$
Therefore
-$\frac{2\pi}{15}$ rad = -$(\frac{2\pi}{15}\times\frac{180}{\pi})^{\circ}$
= -$24^{\circ}$
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