Cosine

Question 1

Ye apparently we aren’t given the damn rules for these so thats just great.

Answer 1

Just great….

Question 2

What’s the sine rule?

Answer 2

a/sin A = b/sin B = c/sin C

And i think it can be reversed so ya

sin A/a = sin B/b = sin C/c

Question 3

What’s the cosine rule?

Answer 3

a^2 = b^2 + c^2 -2bc cos A
additionally
cos A = (b^2 + c^2 - a^2)/2bc

Question 4

The rule for finding the area of the triangle?

Answer 4

Area = 1/2 ab sin C