kaitlynmelton kaitlynmelton
  • 20-06-2017
  • Mathematics
contestada

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

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irspow
irspow irspow
  • 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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