$\"\"$

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The measure of angle $\"\"$ .

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Apply cosines law to determine b,

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Take square root each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Find A. \ \

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Apply Law of sines.

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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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 20.9.

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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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$\"\"$

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Subtract 71 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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The values are $\"\"$ , $\"\"$ , and $\"\"$ .

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\