$\"\"$

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The sides of triangle are $\"\"$ .

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Find the angle $\"\"$ by using Law of Cosines.

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Law of cosines for angle $\"image\"$ : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find the angle $\"\"$ by using Law of Cosines.

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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Sum of the angles of a triangle is 180 degrees.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ , $\"\"$ , and $\"\"$ .