What is $1$ radian ? What is $1$ steradian ?
What is $1$ radian ? What is $1$ steradian ?
$(1)$ Plane angle subtended at centre by arc of circle having length equal to radius is called radian.
$(2)$ Angle subtended on $1 \mathrm{~m}^{2}$ area on sphere of $1 \mathrm{~m}$ radius is called 1 steradian.
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