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Vijay Sharma

· started a discussion

· 1 Months ago

HOW TO DO THE LAST CALCULATION BY APPROXIMATION (Question: 269925.0 )

Can someone tell how to do the last calculation??

Question:

The angle of elevation of the top of an unfinished pillar at a point 150 m from its base is 30º. If the angle of elevation at the same point is to be 45º, then the pillar has to be raised to a height of how many metres?

Options:
A)

59.4 m

B)

61.4 m

C)

62.4 m

D)

63.4 m

Solution:

Ans: (d)

  

Arun

· commented

· 1 Months ago

Its 150 - (150/√3).

150/√3 = (50x3)/√3 = 50√3 = (100x√3)/2 ≈ 173/2 = 86.5
∴ ans ≈ 150 - 86.5 = 63.5.

manchester united

· commented

· 1 Months ago

they think doing such calculation within a minute is a cake walk..
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