Question

I am anew in Class 11th.Can you tell me the meaning of D IN THIS FIGURE.
LIKE D *THEETA*​

Answer 1

Answer:

Explanas the ratio of length of arc ds to the radius r is d(theta). solid angle is the ratio of the intercepted area dA of the spherical surfaceation

Answer 2

Explanation:

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Refer to the above attachment ⬆️⬆️.