# How do I find the value of sin 150?

Sep 16, 2015

Find sin 150

#### Explanation:

You may find sin 150 by 2 ways:

First way. Trig Table gives --> sin 150 deg, or $\sin \left(\frac{5 \pi}{6}\right)$, = 1/2
Second way: by the trig unit circle.

$\sin \left(\frac{5 \pi}{6}\right) = \sin \left(\frac{\pi}{6}\right) = \frac{1}{2}$

Aug 5, 2018

$\sin \left({150}^{\circ}\right) = \frac{1}{2}$
$\sin \left({150}^{\circ}\right) = \sin \left({180}^{\circ} - {30}^{\circ}\right) = \sin {30}^{\circ}$
because $\sin$ is positive in the 2nd quadrant, so
$\sin {30}^{\circ} = \frac{1}{2}$