Posted by AwesomeGuy on Monday, February 4, 2013 at 10:13pm.
An observer in a lighthouse 350 feet above sea level observes two ships directly offshore. The angles of depression to the ships are 4° and 6.5°. How far apart are the ships?
- Trigonometry - Reiny, Monday, February 4, 2013 at 11:01pm
My diagram has the lighthouse as PQ with P at the top and PQ = 350
My ships are at A and B, angle at A = 4° and the angle at B = 6.5°
In the right angled triangle BQP
sin 6.5 = 350/BP
BP = 350/sin 6.5 = .....
now look at triangle ABP
we just found BP
and angle ABP = 173.5°
thus angle APB = 180 - 4 - 173.5 = 2.5°
by the sine law:
AB/sin 2.5 = BP/sin 4°
I will let you finish this, let me know what you got.
- Trigonometry - AwesomeGuy, Tuesday, February 5, 2013 at 1:56am
AB/sin 2.5° = 3091.79/sin 4°
3091.785015 sin 2.5° = 134.8617682
134.8617682/sin 4° = 1933.33
Awesome! Thanks for the help!
- Trigonometry - AwesomeGuy, Tuesday, February 5, 2013 at 2:04am
Since I have also forgot to label the conversion for the solution, it is ultimately measured in FEET.
- Trigonometry - Meh, Thursday, March 12, 2015 at 11:49am
Draw two triangles upside down.
For the first triangle, the angle between the base and the hypotenuse is 4 degrees, and the vertical is 350.
The second triangle, the angle between the base and the hypotenuse will be 6.5 degrees and the vertical is also 350.
Now to find the distance :
1st triangle: 350/tan 4
2nd triangle 350/tan 6.5
now subtract both and you will get 1933.3 feet.
Answer This Question
More Related Questions
- math - an observer in a lighthouse 300 ft above sea level observes 2 ships ...
- Trigonometry - An observer on a cliff 1000 dm above sea level sights two ships ...
- geometry - A child on top of a lighthouse observes two ships that are 90 ft ...
- Geometry - A child on top of a lighthouse observes two ships that are 90 ft ...
- geometry - the pilot of a plane flying 2000 meters above sea level observes two ...
- math - from a height of 40 m above sea level, two ships are traveling due west. ...
- angle - 1.) From the top of a lighthouse 52 metres high,the angles of depression...
- math - You have found a summer job manning a lighthouse off the northern coast ...
- Trig - I have no idea how to do this problem From an airplane flying 2 ...
- maths - a person observed from the top of a light house which is 80 m above the ...