Trigonometry formulas Flashcards by Lily Brain

Q

What is the cosine rule?

A

a^2 = b^2 + c^2 - 2bc Cos (A)

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Q

What is the formula for area of a triangle?

A

1/2 ab sin (C)

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Q

What is the cosine rule for angles?

A

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

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