Sine Rule for Unknown Angles - How and When to Use It - Formula and Examples

The formula for the Sine Rule for Unknown Angles states that the ratio of the sine of any interior angle and its opposite side length is constant throughout the triangle. Here we learn how to find an unknown angle using the sine rule.
We start by stating the formula and explaining what it is saying and how to use it. We then work through two examples in which we find an unknown angle in a non right-angled triangle.

00:00 Introduction and Explanation of Formula
02:00 Worked Examples