Why plane angle is dimensionless physical quantity ?
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1
Answer:
Plane angle has radian or unit which does not come under SI or derived units. Units of plane angles radian and scale angles steradian are dimensionless quantities hence they have been put in a separate category of supplementary units. So, the reason is correct.
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8
Answer:
Plane angle has radian as units. but these do not come under SI or derived units.
Units other than SI units or derived units are called supplementary units.Since they have no units under SI system, they can be considered dimensionless.
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