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9 December, 16:58

Which equation could be used to solve for the length of side c, given a = 5, b = 12, and c = 72°?

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  1. 9 December, 17:07
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    C^2=a^2+b^2-2abcos (c)

    c=sqrt (a^2+b^2-2abcos (c))

    c=sqrt ((5) ^2 + (12) ^2-2 (5) (12) cos (72))

    c=sqrt (25+144-120cos (72))

    c=sqrt (169-120cos (72))

    c=sqrt (169-37.08)

    c=sqrt (131.92)

    c=11.49
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