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A radian compares an arc length with a radius. The quantity is therefore:

ADefenceless
BDimensionless
CDirectionless
DDoubtless
Answer & Solution
Correct answer: B. Dimensionless
1. Both arc and radius are lengths. 2. Dividing one by the other cancels units. 3. So a radian is dimensionless. _Source: OpenStax University Physics Volume 1, Chapter 10, Fixed-Axis Rotation._
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