\"\"

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Find \"\".

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Observe the figure :

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Triangle \"\" is a right triangle and \"\" is the radius of the circle.

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The values of \"\" and \"\".

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In the triangle \"\", \"\".

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\"\".

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Apply Pythagorean theorem to triangle \"\".

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Pythagorean theorem : \"\".

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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 value of \"\".