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In the figure given below, survey line EB passes through an obstacle. The ∠BAC and ∠BAD are 30o and 45o respectively. If AB is 90 m, what will be the length of AC, AD and obstructed portion BC respectively, such that CD is in line with EB produced?


  • a)
    60√3, 90√2, 30√3

  • b)
    60/√3, 70/√2, 10/√3

  • c)
    50/√3, 60√2, 30/√3

  • d)
    40/√3, 80√2, 30√3

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
In the figure given below, survey line EB passes through an obstacle. ...
AC = AB sec 30 = 90 x 2/√3 =180/√3 = (180 x√3) / (√3 x√3) = 180√3/3 = 60√3
AD = AB sec 45 = 90√2
BC = AB tan 30 = 90/√3 = (90 x√3)/ (√3 x√3) = 90√3/3= 30√3
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In the figure given below, survey line EB passes through an obstacle. The ∠BAC and ∠BAD are 30oand 45orespectively. If AB is 90 m, what will be the length of AC, AD and obstructed portion BC respectively, such that CD is in line with EB produced?a)60√3, 90√2, 30√3b)60/√3, 70/√2, 10/√3c)50/√3, 60√2, 30/√3d)40/√3, 80√2, 30√3Correct answer is option 'A'. Can you explain this answer?
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