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4 October, 08:13

When calculating the length of an arc, does it matter which unit of measurement (radians or degrees) you use when measuring the central angle?

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  1. 4 October, 08:43
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    No, it does not matter.

    If you measure the central angle in degress, you use the proportion

    circumference / 360° = length of arc / central angle in degrees,

    and if you measure the angle in radians, you use the proportion

    circumference / (2π) = length of arc / central angle in radians.
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