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Question Number 198907 by a.lgnaoui last updated on 25/Oct/23

$$\mathrm{find}\mathrm{the}\mathrm{Area}\mathrm{betwen}\mathrm{Circle}1\mathrm{and}$$$$\mathrm{Circle}2.$$

Commented by a.lgnaoui last updated on 25/Oct/23

Commented by Rasheed.Sindhi last updated on 26/Oct/23

$$\mathrm{CD}touchescircle2atpoint\mathrm{O}\left(say\right)$$$${\mathrm{AC}}^2-{\mathrm{AO}}^2={\mathrm{OC}}^2$$$${\mathrm{R}}^2-{\mathrm{r}}^2={\left(7/2\right)}^2$$$$\pi {\mathrm{R}}^2-\pi {\mathrm{r}}^2=\frac{49}{4}\pi$$$$\stackrel{\mathrm{area}}{\mathrm{circle}1}-\stackrel{\mathrm{area}}{\mathrm{circle}2}=\frac{49}{4}\pi$$

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