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20-06-2017
Mathematics

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

Respuesta :

20-06-2017

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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