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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is `60^(@)` . when he returns 40 m from the bank, he finds the angle to be `30^(@).` What is the breadth of the river?

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The correct Answer is:
height of tree = 17.32 , river = 10 m
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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60^(@) . When he retires 40 m.from the bank, he finds the angle to be 30^(@) . What is the breadth of the river ?

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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60^(@) , when he retreats 40m from the bank he finds the angle to be 30^(@) . Find the height of the tree and the breadth of the river.

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DISHA PUBLICATION-TRIGONOMETRY AND ITS APPLICATIONS-Practice Exercise (Foundation Level)
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  4. If sintheta+costheta=a and (sintheta+costheta)/(sinthetacostheta)=b, t...

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  7. If x=psectheta and y=qtantheta then

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  8. If btantheta=a, the value of (asintheta-bcostheta)/(asintheta+bcosthet...

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  11. In the adjoining figure, the length of BC is (a)2sqrt3 cm (b)3sq...

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  12. If the angle of depression of an object from a 75 m high tower is 30^@...

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  13. The angle of elevation of the top of a tower at a point G on the groun...

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  14. The top of a broken tree has its top touching the ground (shown in the...

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  15. An aeroplane flying horiontally 1 km above the ground is observed at a...

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  16. A ladder 25 m long is leaning against a wall which is perpendicular to...

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  18. The angles of elevation of the top of a tower from two points at dista...

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