$\"\"$

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

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Apply cosines law: $\"\"$ .

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

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$\"\"$

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Trigonometric value: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find angles $\"\"$ .

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Apply cosines law: $\"\"$ .

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

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$\"\"$

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$\"\"$

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Apply inverse trigonometry property: $\"y$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find angle $\"\"$ .

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Third angle: $\"A$

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Substitute $\"\"$ and $\"\"$ in the above formula.

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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