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Abhishek

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· 1 Months ago

Short Cut (Question: 115780.0 )

Assume alpha = 22.5 then, tan alpha=squareroot2 -1, tan 2alpha= 1, and tan 3alpha= Squareroot2 +1, then make the equation and check with options. It will come h=x/squareroot2 => h= x sin 2alpha

Question:
The angle of elevation of the top of a TV tower from three points A, B, C in a straight line through the foot of the tower are \(\alpha\), 2 \(\alpha\) and 3\(\alpha\) respectively. If AB = x, then the height of the tower is : 
Options:
A) x cos\(\alpha\)
B) x sin 2\(\alpha\)
C) x sin 3\(\alpha\)
D) x tan \(\alpha\)
Solution:
Ans: (b)


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