An electrician has to repair an electric fault on a pole of height 4 m. He needs to reach a point 1.3 m below the top of the pole to undertake the repair work. What should be the length of the ladder that he should use which when inclined at an angle of 60° to the horizontal would enable him to reach the required position
Answers
Answer:
answr
search
What would you like to ask?
10th
Maths
Some Applications of Trigonometry
Heights and Distances
An electrician has to repai...
MATHS
avatar
Asked on December 26, 2019 by
Harshdeep Duvvuru
An electrician has to repair an electric fault on a pole of height 4 m. He needs to reach a point 1.3 m below the top of the pole to undertake the repair work. What should be the length of the ladder that he should use which when inclined at an angle of 60
∘
to the horizontal would enable him to reach the required position?
MEDIUM
Share
Study later
ANSWER
Let AC be the electricpole of height 4 m. Let B be a point 1.3 m below the top A of the pole AC.
Then, BC = AC - AB = (4 - 1.3)m = 2.7 m
Let BD be the inclined at an angle of 60
∘
to the horizontal.
In ΔBCD, we have
sin60
∘
=
BD
BC
⇒
2
3
=
BD
2.7
[∵BC=2.7m]
⇒BD=
3
2×2.7
m=
3
5.4
m=
3
5.4×
3
m
⇒BD=(1.8)
3
m=
5
9
3
m
Hence, the length of the ladder should be
5
9
3
m.
Step-by-step explanation:
I hope it help you guys..... Mark me as brainliest.....
Answer:
I think the final answer is 40