Several new concepts are introduced: the sine rule and cosine rule - for finding angles and side lengths, as well as the sine rule for the area of a triangle.
Here are the notes for of the topic so far (19-2-15), except for the area rule - you will have to watch the first video for that one if you missed it.
Here are the notes for of the topic so far (19-2-15), except for the area rule - you will have to watch the first video for that one if you missed it.
Here are some videos you could watch to understand the topic further. There are also other videos on youtube for each of these rules if you look around
The Sine Rule for finding an angle or a side:
The Cosine Rule for finding a side
Merit/Excellence Skill: The ambiguous case of the sine rule for finding an angle:
More videos on non-right angled trigonometry
https://mathispower4u.wordpress.com/2010/06/18/the-law-of-sines-the-ambiguous-case/
https://mathispower4u.wordpress.com/2010/06/18/the-law-of-sines-the-ambiguous-case/