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Question Number 121244 by benjo_mathlover last updated on 06/Nov/20

Commented by liberty last updated on 06/Nov/20

Commented by liberty last updated on 06/Nov/20

$$\left(1\right)\sin 30°=\frac{2}{\mathrm{OA}}\Rightarrow \mathrm{OA}=4$$$$\left(2\right)\mathrm{AD}=\sqrt{{14}^2-7^2}=\sqrt{7^2(4-1)}=7\sqrt{3}$$$$\left(3\right)\mathrm{OD}=\mathrm{AD}-\mathrm{OA}=7\sqrt{3}-4\mathrm{cm}$$$$7\sqrt{3}-4=$$$$8.124356$$

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