Sum

A tower is 100√3 metres high. Find the angle of elevation of its top from a point 100 metres away from its foot.

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#### Solution

Let AB be the tower of height 100√3 metres, and let C be a point at a distance of 100 metres from the foot of the tower.

Let θ be the angle of elevation of the top of the tower from point C.

In ∆CAB, we have

`\tan \theta =\frac{AB}{AC} `

`\Rightarrow \tan \theta =\frac{100\sqrt{3}}{100}=\sqrt{3}`

⇒ θ = 60º

Hence, the angle of elevation of the top of the tower from a point 100 metres away from its foot is 60º.

Concept: Heights and Distances

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