This week in math we learned about Sine Law in trigonometry. You can only use Sine Law when there is a number for an angle and its side (the side opposite of the angle). To use Sine Law you must also have at least three clues. This law can also be used for right triangles. The original formula for Sine Law is:

\frac{a}{SineA} = b/SineB = \frac{c}{SineC}, this version of the formula is for when you are trying to find missing sides. When you are trying to find missing angles, you would use the formula:

\frac{SineA}{a} = \frac{SineB}{b} = \frac{SineC}{c}

For example if you were given this triangle, and were told to find side a, you would first put in the information that you are given into the formula. From there you would use the two fractions that have information in them and use algebra to get ‘a’ by itself, and then put the equation into your calculator to get the final answer of a ≅ 21.1cm.

The picture bellow is of the full question that I just went over: