Cosine Flashcards
1
Q
Ye apparently we aren’t given the damn rules for these so thats just great.
A
Just great….
2
Q
What’s the sine rule?
A
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
3
Q
What’s the cosine rule?
A
a^2 = b^2 + c^2 -2bc cos A
additionally
cos A = (b^2 + c^2 - a^2)/2bc
4
Q
The rule for finding the area of the triangle?
A
Area = 1/2 ab sin C