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How do you define radian?

Updated: 4/28/2022
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8y ago

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An informal definition: If you take a radius of a circle and wrap it around its circumference then the angle which that arc will make at the centre of the circle is 1 radian.

More formally, a radian is 1/(2*pi) of a whole angle.

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8y ago
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Q: How do you define radian?
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