Giúp giùm 2 bài Trig này plz...

• 

  emyeuanht2001

  
  December 9th 2008, 1:40 pm

• bây giờ thêm 2 bài mình ko hiểu nữa....có bạn nào có lòng tốt thì giup giùm mình nha, mình cần gấp lắm.... CÁI NÀY LÀ Trigonometry NHA. 1. Radio direction finders are at points A and B, which are 3.46 miles apart on an east west line, with A west of B. From A the bearing of a certain radio transmitter is 47.7 degree, and from B the bearing is 302.5 degree. Find the distance of the transmitter from A. ( cái bài này ko biết tại sao mình tìm answer ra negative nữa)
  2. A helicopter is sighted at the same time by two ground observers who are 3 miles apart on the same side of the helicopter. They report angles of elevation as 20.5 degree and 27.8 degree. How high is the helicopter. Bạn nào giúp mình,t hì mình biết ơn nhiều nha....thanks alot....

• 

  mltr

  
  December 9th 2008, 3:53 pm

• hm ... you shoud draw pictures ... that helps to solve this kind of problems.

• 

  emyeuanht2001

  
  December 9th 2008, 5:17 pm

• [img][/img]
  is it support to be like this on #1 /???

• 

  mltr

  
  December 9th 2008, 5:47 pm

• no, read about bearing again so you can have the correct angles .... also, A & B supposed to be on East West line .... and yes, it will form a triangle.

• 

  emyeuanht2001

  
  December 9th 2008, 8:04 pm

• i don't get it......

• 

  4 Beauty

  
  December 9th 2008, 8:32 pm

• i'm not sure lol but i'm trying to help and refreshing myself
  
  
  
  
  [img][/img]
  
  would that be the right picture for number 2?? lol

• 

  mltr

  
  December 9th 2008, 8:51 pm

• @4: both are wrong
  
  @EYA: the angles must be correct in order to solve the problem ... ok, the angle starts from North, goes clockwise. Now, you can construct the 302.5 & 47.7, can't you:???: ... Draw the picture with those two angles

• 

  4 Beauty

  
  December 9th 2008, 9:12 pm

• what the hell i don't know how i pass trig with an A then i guess my charming works all the time

• 

  emyeuanht2001

  
  December 9th 2008, 10:34 pm

• sorry, i'm so stupid, , i tried but it still doesn't make any sense 2 me ??? can you draw a picture to explain plz ???
  
  Is this right ?
  [img][/img]

• 

  mltr

  
  December 10th 2008, 1:40 am

• emyeuanht2001 wrote:sorry, i'm so stupid, , i tried but it still doesn't make any sense 2 me ??? can you draw a picture to explain plz ???
  
  Is this right ?
  [img][/img]

  
  
  No, the angles you drew are not correct
  Look at the picture here
  
  
  problem 2: View as 3D
  

• 

  emyeuanht2001

  
  December 10th 2008, 2:33 am

• oh ok, thanks alot........mltr..