Cosine Flashcards

1
Q

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

A

Just great….

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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

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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

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4
Q

The rule for finding the area of the triangle?

A

Area = 1/2 ab sin C

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