Where we can normally only use trig in right-angled triangles, the Sine rule allows use to expand that knowledge to other triangles that doesn't have right angles.
The focus of this slide show is to demonstrate the proof of the Sine-Rule. But I have also put in some animated examples of using the Sine rule and explained why sometimes the Sine-rule will give you more than one answer (ambiguous case of the Sine rule) and that both of them will be correct.
Learners need a basic grounding in trigonometry especially in solving trig equations.
I did not include a lesson plan, but there is quite extensive notes with each slide to indicate how I use the slides. I normally do this over 2-3 lessons. Combined with lots of practice.
At the end I added a mindmap of the sine rule, cosine rule and area rule, that I made for my class to use as a reference source.