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Question Number 144139 by bobhans last updated on 22/Jun/21

Answered by liberty last updated on 22/Jun/21

Commented by EDWIN88 last updated on 22/Jun/21

$$\frac{4}{\mathrm{R}}=\frac{8}{12+\mathrm{R}}\Rightarrow \frac{1}{\mathrm{R}}=\frac{2}{12+\mathrm{R}};\mathrm{R}=12$$

Commented by mr W last updated on 22/Jun/21

$$\frac{R-4}{R+4}=\sin 30°=\frac{1}{2}$$$$\Rightarrow R=12$$

Answered by mr W last updated on 22/Jun/21

$$R=3\sqrt{4\times 4}=12$$$$generalcaseseeQ77425$$

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