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Question

Two pillars are of equal height on either sides of a road which is 100 m wide. The angles of elevation of the top of the pillars are 60 and 30 at a point on the road between the pillars. Find the position of the point between the pillars and height of each pillar

A
43.3m
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B
28m
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C
45.3m
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D
54m
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Solution

The correct option is A 43.3m
Let AB and ED be two pillars each of height h metres Let C be a point on he road BD such that
BC=x metres Then CD=(100x) metres Given ACB=60 and ECD=30
In ΔABC,tan60=ABBC 3=hxh=3x..........(i)
In ΔECD,tan30=EDCD 13=h100xh3=100x...........(ii)
Subst. the value of h from (i) in (ii) we get
3x×3=100x3x=100x4x=100x=25m
h=(3×25)=25×1.732m=43.3m
The required point is at a distance of 25 m from the pillar B and the height of each pillar is 43.3m

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