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20 December, 02:58

If angle A equals 30 degrees, then find the length of BC when AB is 6 and AC is 7.

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  1. 20 December, 03:13
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    By the Law of Cosines, (a^2=b^2+c^2-2bc*cosA°)

    BC=6^2+7^2-2*6*7*cos30°

    BC=85-84cos30° units

    BC≈12.25 units (to nearest hundredth of a unit)
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