algrbra/trigonometry

in triangle ABC, angle a=120, b=10, and c=18. What is the area of triangle ABC tot he nearest square inch?

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asked by Sally
  1. perfect setup for using
    area = (1/2)(b)(c)sin A, where A is the contained angle.
    area = (1/2)(10)(18)sin 120°
    = 77.94 or 45√3 as an exact value.

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    posted by Reiny
  2. this is wrong.

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    posted by kiki

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