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Step-by-step Answer
PAGE: 482SET: ExercisesPROBLEM: 2
Please look in your text book for this problem Statement

You know the measures of two sides and their included angle, so use the

Law of cosines to find the unknown side measure.

In , by the law of cosines,

Substitute

     (Evaluate powers)

              (Multiply)

                           (Add)

                         (Take the square root of each side)

                                                              (Use a calculater)

The unknown side  measure  .



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