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Math

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If I am give the the sides of a triangle, where

Side RA=4
Side AB=4.8
Side RB=7.1

How do I find Angle RAB?

Thanks!

  • Math -

    Law of Cosines

    C^2=a^2+b^2-2abCosC

    so label your sides a, b, c

    you want angle c to equal RAB
    so RB=C
    RA=a
    AB=b

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