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Question Number 60816 by ANTARES VY last updated on 26/May/19

$$\mathbf{S}=4\mathit{\pi }{\mathbf{R}}^2\mathbf{prove}$$

Answered by tanmay last updated on 26/May/19

$$ds=Rd\theta \times Rsin\theta d\varphi$$$$S=R^2{\int }_0^{\pi }sin\theta d\theta {\int }_0^{2\pi }d\varphi$$$$=R^2\times 2\times 2\pi =4\pi R^2$$$$$$$$$$

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