$\"\"$

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Observe the diagram.

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Find the value of side $\"\"$ .

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Pythagorean Theorem : $\"\"$ .

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$\"\"$

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Tthe length of opposite side to $\"\"$ is $\"\"$ .

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The length of adjacent side to $\"\"$ is $\"\"$ .

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The length of the hypotenuse is $\"\"$ .

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Find angles of a rightangle triangle $\"\"$ and $\"\"$ using trigonometric functions.

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Trigonometric function : $\"\"$ .

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$\"\"$

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Use defnition of inverse cosine function $\"\"$ if and only if $\"\"$ .

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$\"\"$

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In the diagram sum of angles $\"\"$ and $\"\"$ is equal to $\"\"$ .

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$\"\"$

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

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$\"\"$

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