Answer
$\sin{\frac{\pi}{4}} =\frac{\sqrt2}{2}$
Work Step by Step
$\frac{\pi}{4}$ is a special angle that intersects the unit circle at the point $(\frac{\sqrt2}{2}, \frac{\sqrt2}{2})$.
Since $\sin{\theta}=y$, then
$\sin{\frac{\pi}{4}} =\frac{\sqrt2}{2}$
