Answer
$x= 24.62147$ cm
Work Step by Step
Since, opp =x and adj=25 cm
Thus,
$tan\theta=\frac{opp}{adj}$
$tan(\frac{2\pi}{5})=\frac{x}{8 }$
Need to solve $x$.
$x=tan(\frac{2\pi}{5})\times 8$
Hence, $x= 24.62147$ cm
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