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Question Number 13373 by Stargazer last updated on 19/May/17

Commented by Stargazer last updated on 19/May/17

$$findtheareaofthering?$$

Commented by prakash jain last updated on 20/May/17

$$\mathrm{Inner}\mathrm{circle}\mathrm{radius}\mathrm{is}r\sin \theta .$$$$\mathrm{Width}\mathrm{of}\mathrm{ring}\mathrm{is}\mathrm{not}\mathrm{clear}\mathrm{from}$$$$\mathrm{the}\mathrm{picture}$$

Commented by Stargazer last updated on 20/May/17

$$itsrd\theta$$

Commented by prakash jain last updated on 20/May/17

$$\pi {(r\sin \theta +rd\theta )}^2-\pi {\left(r\sin \theta \right)}^2$$$$=\pi r^2(2\sin \theta d\theta +{\left(d\theta \right)}^2)$$

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