Question

define radian and stradian

Answer 1

hey mate!!

here's ur answer dear:-)
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⚫ Radian :-

Radian is a unit used for measuring angles. 1 radian is equal to the angle subtended by the center of the circle by an arc on the circumference which is equal to the radius.

Now,

180° = π radians
1 degree = π /180 radians or about 0.01745 radians
1 radian = (π/180)° or about 57.296°

⚫ Steradian [ I think it would be steradian instead of stradian as u have written above]

✔ Steradian or also called square radian is the SI unit of Solid angle. the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius.

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hope it helps:-)

#thankyou....☺☺