1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Klio2033 [76]
3 years ago
10

the angle of elevation of an object from a point 200 meters above a lake is 30 degrees and the angle of depression of it's image

in the lake is 45 degrees. Find the height of the object above the lake.

Mathematics
1 answer:
valkas [14]3 years ago
3 0
Let h and d represent the height of the object above the lake and its horizontal distance from the observer, respectively.

Looking at the reflection of the object in the lake's surface is equivalent to observing the object at distance h below the lake's surface, or observing it from 200 m below the lake's surface. Considering the latter case, we have
  (h+200)/d = tan(45°)
  (h -200)/d = tan(30°)
Solving these for d and equating the results gives
  (h+200)/tan(45°) = (h -200)/tan(30°)
Solving for h, we get
  h(1/tan(30°) -1/tan(45°)) = 200(1/tan(45°) +1/tan(30°))
  h = 200(tan(45°) +tan(30°))/(tan(45°) -tan(30°))
  h ≈ 746.41

The object is about 746.4 meters above the lake.

You might be interested in
Can someone help me one these two​
strojnjashka [21]

On the top problem:  Angle A and Angle B are a right angle so it equals 90 degrees.  If Angle B is 50 degrees that makes Angle A 40 degrees.  Angle A and Angle C is a straight line and equals 180 degrees so if Angle A equals 40 degrees that means Angle C equals 140 degrees.

8 0
3 years ago
212.35 into a fraction
Alla [95]

Answer: 212 7/20

Step-by-step explanation: We know that 212 is the whole number. So we need to convert .35 into a fraction in simplest form. Any decimal that has a hundredths place will be divided by 100 to get the fraction. In this case that fraction would be 35/100. And to convert that into simplest form, you need to find the least (or lowest) common denominator which is 5. Then you divide the numerator and denominator by 5 and get 7/20, so your answer is 212 7/20

5 0
3 years ago
(12) - (23 +131) =<br> Express your answer in the form (a + bi),
4vir4ik [10]

Answer:

-142

Step-by-step explanation:

First solve parenthesis,

(12) - (23 +131) =

(12) -154

Finally subtract,

12-154

= -142

5 0
2 years ago
The 8% sales tax was $3.88. What was the price of the game before tax?
tatuchka [14]

Answer:

$3.57

Step-by-step explanation:

8 0
3 years ago
Round the number 33,485 to the thousands place
mixer [17]

Answer:

33,000

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • If sin Θ = negative square root 3 over 2 and π &lt; Θ &lt; 3 pi over 2, what are the values of cos Θ and tan Θ? cos Θ = negative
    10·2 answers
  • Which pair of functions is not a pair of inverse functions?
    6·1 answer
  • Evaluate the expression.
    8·1 answer
  • Which shape has the same volume as the given cylinder?
    6·2 answers
  • Answer the following questions CORRECTLY I will know if this is wrong. I WILL REPORT ANY INCORRECT ANSWERS!
    8·2 answers
  • Find the perimeter of each polygon. Assume that lines which appeared to be tangent are tangent. ​
    15·2 answers
  • Please help pretty basic question thankyou !
    10·2 answers
  • Help me pleasee!!!!!!!!!!!!!!!
    11·1 answer
  • Which best describes how the graph of g(x) = square root of 25/9 x relates to the graph of the parent function, f(x) = square ro
    6·1 answer
  • What single percentage change is equivalent to a 23% decrease followed by a 16% increase?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!