# North, East, South, West airplane thingy

• Sep 20th 2009, 03:25 PM
Minty
North, East, South, West airplane thingy
Hi, thank you (again?) for taking the time to look at my problem.

A helicopter makes a forced landing at sea. The last radio signal received at station C gives the bearing of the helicopter from C as N 57.1degrees E at an altitude of 423 feet. An observer at C sights the helicopter and gives <DCB as 12.1 degrees. How far will a rescue boat at A have to travel to reach any survivors at B? Apply the rules regarding the use of sgnificant digits when determining your answer.

I redid the figure on paint. The helicopter pictures are at D and B.

How should I do this?
• Sep 20th 2009, 08:10 PM
skeeter
Quote:

Originally Posted by Minty
Hi, thank you (again?) for taking the time to look at my problem.

A helicopter makes a forced landing at sea. The last radio signal received at station C gives the bearing of the helicopter from C as N 57.1degrees E at an altitude of 423 feet. An observer at C sights the helicopter and gives <DCB as 12.1 degrees. How far will a rescue boat at A have to travel to reach any survivors at B? Apply the rules regarding the use of sgnificant digits when determining your answer.

I redid the figure on paint. The helicopter pictures are at D and B.

How should I do this?

where is A ?
• Sep 20th 2009, 08:41 PM
Minty
Oops, sorry, fixed

Edit: It's rather tiny but it's still visible. x3;
• Sep 20th 2009, 10:49 PM
Matt Westwood
First thing to do is find CB. You can do this by using tangent, as you have the height of where the chopper is, and the angle has also been given. Then you can find CA by trig again: B is the hypotenuse, and angle ACB you've been given.

Fine diagram, by the way - good job.
• Sep 22nd 2009, 03:33 PM
Minty
Ohh I see
Thank you very much <3