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Angle of elevation and depression...

Angle of elevation and depression

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`90^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • From the top of a pillar of height 20 m, the angles of elevation and depression of the top and bottom of another pillar are 30^(@) and 45^(@) , respectively. Then, the height of the second pillar (in m) is

    A
    `(20)/(sqrt(3))(sqrt(3) - 1)`
    B
    `(20)/(sqrt(3))(sqrt(3) + 1)`
    C
    `20sqrt(3)`
    D
    `(20)/(sqrt(3))`

  • From the top of a house A in a street, the angles of elevation and depression of the top and foot of another house B on the opposite side of the street are 60^(@) and 45^(@) , respectively. If the height of house A is 36 m, then what is the height of house B? (Your answer should be nearest to an Integer.

    A
    91 cm
    B
    93 m
    C
    94 m
    D
    98 m

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    The angles of elevation and depression of the top bottom of a light-house from the top of a 60m high building are 30^(@) and 60^(@) respectively.Find the difference between the heights of the light house and the building.the distance between the light-house and the building.

    A window of a house is h metres above the ground. From the window, the angles of elevation and depression of the top and bottom of another house situated on the opposite side of the lane are found to be alpha and beta respectively. Prove that the height of the house is h(1 + tan alpha cdot tan beta) metres.

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