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Trignometry

Scorching goIITian

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1 Mar 2009 18:50:23 IST

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Heights and distances A square tower stands upon a horizontal plane.From a point in this plane thre

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Heights and distancesA square tower stands upon a horizontal plane.From a point in this plane three of its upper corners are visible their angular elevations are respectively 45, 60 and 45. show that the height of the tower is to the breadth of one of its sides as root6(root5 + 1) to 4.

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Anirudh Kumar

Scorching goIITian

Joined: 25 Jan 2009

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2 Mar 2009 18:09:02 IST

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anyone can't solvve the question or people not trying

pink_ele

Blazing goIITian

Joined: 16 Jan 2007

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2 Mar 2009 18:36:33 IST

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if we project the problem on horizontal plane we get....

also again by cosine formula

we have cos2@=2cos^2@-1

so....using dis in dese two eqn we have

its one of d roots ...other being 1-rt5

lemme post related fig

pink_ele

Blazing goIITian

Joined: 16 Jan 2007

Posts: 1836

2 Mar 2009 19:00:14 IST

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dis is figure of related plane and not the 3d building......cos we don need z axis...once we have found projection of h on the plane

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