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Question Number 157425 by cortano last updated on 23/Oct/21

Answered by mr W last updated on 23/Oct/21

$$r^2={(8+r)}^2-{(7+r)}^2=15+2r$$$$(r+3)(r-5)=0$$$$\Rightarrow r=5$$$$fractionofshadedarea={\left(\frac{r}{8+r}\right)}^2=\frac{25}{169}$$

Commented by Tawa11 last updated on 23/Oct/21

$$\mathrm{Weldone}\mathrm{sir}$$

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