Pure Year 1 C9 Flashcards by Katie Burns | Brainscape

Q

Cosine rule =

A

2 Sides & 1 Angle between

a² = b² + c² - 2bcCOSA

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Q

To find angle if 3 sides known..

A

Cos A = b² + c² - a² / 2bc

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Q

Produce 2 solutions for missing angle ..

A

sin = sin ( 180 - angle)

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Q

Area of triangle

A

½ab sin C

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