$\"\"$

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The measure are $\"\"$ .

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Apply law of cosines to determine angle A.

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$\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$

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$\"\"$

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Subtract 685 from each side.

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$\"\"$

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$\"\"$

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Divide each side by 684.

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$\"\"$

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$\"\"$

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Apply inverse function.

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$\"\"$

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$\"\"$

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$\"\"$

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Find C

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$\"\"$ (Apply Law of sines)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$

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Apply Cross multiplication $\"\"$ then $\"\"$ .

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$\"\"$

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$\"\"$

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Divide each side by 15.

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$\"\"$

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$\"\"$

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Apply inverse function.

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$\"\"$

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$\"\"$

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$\"\"$

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The sum of the angle measures of a triangle is $\"\"$ .

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$\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$

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Subtract 118 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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The angles of $\"\"$ , $\"\"$ and $\"\"$ .