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Question Number 198114 by Tawa11 last updated on 10/Oct/23

Commented by mr W last updated on 10/Oct/23

$$itshouldbe20m\cancel{longer}shorter.$$

Answered by mr W last updated on 10/Oct/23

Commented by Tawa11 last updated on 10/Oct/23

$$\mathrm{Thanks}\mathrm{sir}.\mathrm{God}\mathrm{bless}\mathrm{you}.$$

Commented by mr W last updated on 10/Oct/23

$$l_1=\frac{h}{\tan 30°}$$$$l_2=\frac{h}{\tan 60°}$$$$\mathrm{\Delta }l=l_1-l_2=(\frac{1}{\tan 30°}-\frac{1}{\tan 60°})h$$$$\Rightarrow h=\frac{\mathrm{\Delta }l}{\frac{1}{\tan 30°}-\frac{1}{\tan 60°}}=\frac{20}{\sqrt{3}-\frac{1}{\sqrt{3}}}=10\sqrt{3}$$

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