Step 1:

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

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The angle is $\"\"$ .

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Apply cosine rule: $\"\"$ .

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

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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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Step 2:

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Find angle $\"\"$ .

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Apply cosinr rule: $\"\"$ .

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

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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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The angle is $\"\"$ .

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Solution:

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$\"\"$ .