$\"\"$

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Two radians equals to 360 degrees, i.e, $\"\"$ .

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$\"\"$

\

Thus, $\"\"$ radians.

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$\"\"$

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One radian is equals to 180 degrees, i.e, $\"\"$ .

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$\"\"$

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Thus, $\"\"$ .

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$\"\"$

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$\"\"$ radians.

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$\"\"$ .