Home
Class 11
MATHS
A tower subtends angles alpha, 2alpha,...

A tower subtends angles ` alpha, 2alpha, 3alpha ` at A,B and C all lying on the horizontal line through the foot of the tower the AB/BC =

A

` (sin 3 alpha )/( sin 2 alpha) `

B

` 1+ 2 cos 2alpha `

C

` 2 + cos 2 alpha `

D

` ( sin 2 alpha )/( sin alpha ) `

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise PRACTICE EXERCISE|132 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise LECTURE SHEET EXERCISE - I ( Straight Objective Type Questions ) |58 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise EXERCISE - 1|98 Videos

  • PLANES

    AAKASH SERIES|Exercise ADVANCED SUBJECTIVE TYPE QUESTIONS|30 Videos

  • PROPERTIES OF VECTORS

    AAKASH SERIES|Exercise PRACTICE EXERCISES|55 Videos

Similar Questions

Explore conceptually related problems

A tower subtends angles alpha,2 alpha, 3 alpha respectively at points A,B and C all lying on a horizontal line through the foot of the tower, Then (AB)/(BC)=

A flag staff of the height (a-b) stands on the top of a tower subtends the same angle at the point on the horizontal plalne through the foot of the tower which are at distant a and b from the tower. The height of the tower is

A tower stands at the top a hill whose height is three times the height of the tower. The tower is found to subtend an angle of Tan^(-1)(1/7) at a point 2 km away on the horizontal throught the foot of the hill. Then the height of the tower is

A tower subtends an angle alpha at a point A on the same level as the foot of the tower B is a point vertically above A and AB = h metres. The angle of depression of the foot of the tower from B is beta . The height of the tower is

The angle of elevation of the top of a tower standing on a harzontal plane from the two points lying on a line passing through the foot of the tower at distances a and b respectively are complementary angles. If the line joining the two points sutends an angle theta at the top of the tower, then sintheta is

A flag staff on top of the tower 30mt of height subtends an angle of - tan^(-1)((1)/(3)) at a point on the ground 50mt from the foot of the tower. The height of the flag staff is

A flag staff on the top of the tower 80 mt of height subtends an angle Tan^-1 (1//9) at a point on the ground 100 mt from the foot of the tower. The height of the flag staff is

A flag-staff stands on a tower which is on level ground. The total height of the flag-staff and tower taaken together is 300 metres. The flag-staff subtends an angle of Tan^(-1)(1/5) at a point P on the level ground at a distance 300 metres from the foot of the tower. The heightof the tower is

The top of a clock tower is observed at angle of elevation of alpha^(@) and the foot of the tower is at the distance of d meters from the observer. Draw the diagram for this data.

AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. If in a Delta ABC , r1 =2r2=3r3, then b: c=

    Text Solution

    |

  2. If cot ""(A)/(2) = 30 , Cot "" (B)/(2) = 50 , Cot "" ( C)/(2) = 70...

    Text Solution

    |

  3. A tower, of x metres high, has a flagstaff at its top. The tower and t...

    Text Solution

    |

  4. A ladder of 20 mt long reaches a point 20 mt below the top of a flag s...

    Text Solution

    |

  5. The angle of elevation of the toop point P of the vertical tower PQ of...

    Text Solution

    |

  6. A lamp post is sittuated at the middle point M of the side AC of a tri...

    Text Solution

    |

  7. A flag staff stands vertically on a pillar. The height of the flag sta...

    Text Solution

    |

  8. A tower subtends angles alpha, 2alpha, 3alpha at A,B and C all lyin...

    Text Solution

    |

  9. The upper (3)/(4) the portion of a vertical pole subtends an angle...

    Text Solution

    |

  10. A vertical pole subtends an angle Tan ^(-1) (( 1)/(2)) at a point ...

    Text Solution

    |

  11. The sides of a right angled trinagles are in A.P., then they are in th...

    Text Solution

    |

  12. The angle of elevation of the top of the tower is 45^(@) on walking up...

    Text Solution

    |

  13. The angle of elevation of a tower from two point which are distance h...

    Text Solution

    |

  14. The upper 3//4 of a ship's mast subtends at a point on the deck whic...

    Text Solution

    |

  15. AB is vertical pole with B at ground level and A at the top. A man fi...

    Text Solution

    |

  16. The angle of elevation of the top of the tower is 45^(@) on walking up...

    Text Solution

    |

  17. The angle of a triangle ABC are in an arithmetic progression . The lar...

    Text Solution

    |

  18. In Delta ABC , if x=tan((B-C)/(2))tan.(A)/(2),y=tan((C-A)/(2))tan.(B)/...

    Text Solution

    |

  19. In Delta ABC, if the sides a,b,c are in geometric progression and the ...

    Text Solution

    |

  20. In a Delta ABC if angle A=90^@, then cos^(-1)(( R)/(r2 +r3)) is equal

    Text Solution

    |