$\"\"$

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Observe the figure:

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

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Consider $\"\"$ and $\"\"$ .

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Use the side lengths to find the angle $\"\"$ :

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Formula for angles of sine, cosine and tangent:

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

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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

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$\"\"$

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