Aspire Faculty ID #18690 · Topic: NIMCET 2026 · Just now
NIMCET 2026

From the top of a viewpoint at a height of 80 m, the angles of depression of the top and bottom of a flag standing on the same plane are $30^\circ$ and $45^\circ$. Find the height of the flag.

Solution

Let the distance between viewpoint and flag be $x$. 

For bottom of flag: 
$\tan45^\circ=\frac{80}{x}$ 
$x=80$ 
Let height of flag be $h$. 
For top of flag: $\tan30^\circ=\frac{80-h}{x}$
$\frac{1}{\sqrt{3}}=\frac{80-h}{80}$ 
$80-h=\frac{80}{\sqrt{3}}$ 
$h=80-\frac{80}{\sqrt{3}}$ 
$h=80\left(1-\frac{1}{\sqrt{3}}\right)$ 
Answer: $(c) 80\left(1-\frac{1}{\sqrt{3}}\right)$

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