How do I Find the Value of Sin 150

How do I find the value of sin 150?

The value of Sin 150° is ½. The steps involved in the calculation are sin (150°) = sin (180 – 30)° =  sin 30° = ½. The explanation of these steps has been provided in the following. 

We find that the value of sin of 150 degrees and the value of sin of 30 degrees are equal. The angle of 150 degrees lies within the 2^nd quadrant. Hence, we calculate sin 150 degrees value as positive. The triangle’s internal angle is 180 – 150 = 30 degrees. This is also the reference angle. We find that the sine’s value in other quadrants that is 3^rd as well as 4^th is always negative.