Step 1:

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The sides of a triangle are $\"\"$ , $\"\"$ and $\"\"$ .

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Solve the triangle by using Law of cosines.

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Formula: $\"\"$ .

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Substitte corresponding values in the formula.

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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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Formula: $\"\"$ .

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Substitte corresponding values in the formula.

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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The sum of three angles in a triangle is $\"\"$ .

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$\"\"$

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$\"\"$ .

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Three angles of the triangle are $\"\"$ , $\"\"$ and $\"\"$ .

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Solution:

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Three angles of the triangle are $\"\"$ , $\"\"$ and $\"\"$ .