alleryThe SI unit of plane angle is the:
ASecond
BRadian
CDegree
DGradian
Answer & Solution
Correct answer: B. Radian
1. Plane angle is defined as arc length over radius.
2. That ratio has its own named unit in SI.
3. It is the radian.
_Source: syllabus Physics Part I, Chapter 2, Units and Measurement._
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