define two supplementary units of International System of units
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Radian- A radian is the plane angle between two radii of a circle that cuts off an arc on the
circumference equal in length to the radius.
Steradian-A steradian is the solid angle which, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides equal in length to the radius of the sphere.
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Steradian-A steradian is the solid angle which, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides equal in length to the radius of the sphere.
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