This week in math, we learnt the sine and cosine law = different ways to find angles and sides of triangles!

SINE LAW:

to find a side —> a/sinA = b/sinB = c/sinC —> ___(___)/____

to find an angle —> sinA/a = sinB/b = sinC/c —> sin^-1(___(___)/___)

COSINE LAW:

to find a side —> a^2 =√b^2 + c^2 -2bc cosA

to find an angle —> cos^-1 ((b^2 + c^2 – a^2)/(2(b)(c))) = A

My biggest mistake this week was not knowing when to use inverse signs and when not to! You need them when finding an angle with sine law, but not finding a side, and same with cosine law. However, at first, I did not realize this, so I added inverse sin or cos at the beginning of every equation, which kept leading me to an “error” screen on my calculator.