If a=4 b=7 and c=9 then A=???

Weird triangle | Wyzant Ask An Expert

Inactive Tutor answered • 05/27/16

Tutor

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When you know 2 sides of a triangle and don't know the angle that is opposite to the known angle, then you can use law of cosine.

a² = b² + c² - 2abCos(A)

Solve for A from this equation.

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