$\"\"$

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

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Law of cosines: $\"\"$ .

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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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Apply trigonometry inverse property: $\"y$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Law of cosines: $\"italic$ .

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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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Apply trigonometry inverse property: $\"y$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Find angle $\"\"$ .

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Formula: $\"A$ .

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