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1.2.1
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Supplementary SI units
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Quantity
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Unit
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Name
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Symbol
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Plane angle
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radian
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rad
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Solid angle
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steradian
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sr
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Definitions of supplementary SI units:
- Plane angle unit
The radian is the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius.
- Solid angle unit
The steradian is the solid angle of a cone which, having its vertex in the centre of a sphere, cuts off on the surface of the sphere an area equal to that of a square with sides equal to the radius of the sphere.
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CHAPTER II CONTENT OF A EUROPEAN PATENT APPLICATION (OTHER THAN CLAIMS)
1.2.2 Derived SI units
