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? asked in Science & MathematicsMathematics · 6 years ago

help (trig maths q, calculator)?

Need help with this question.

I've found AC = √34

But I don't know how to find C in the formula

1/2abSin(C)

I've tried all that I can think

Please list steps thank you

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1 Answer

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  • Prateek
    Lv 5
    6 years ago
    Favorite Answer

    Area of ▲ABC = (1/2) (BD) (AC) = (1/2) (AB) (BC)

    So, (BD) (AC) = (AB) (BC)

    Or, BD = (AB) (BC) / (AC) = (5) (3) / sqrt (34) = 2.5725

    AC = sqrt (34) = 5.831

    Total length of the bars

    = AB + BC + AC + BD

    So just add them.

    To find C, apply the formula,

    cos (C) = (a^2 + b^2 - c^2) / (2ab)

    Here a = BC, b = CA, c = AB

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