Mimi_x3
  • Mimi_x3
An electricity tower is h metres high. The elevation angles of the tower from Aaron and Kevin are respectively 45° and 30° . On the ground, relative to the tower the bearings of Aaron and Kevin are respectively SW and SE. If the boys are 50m apart, find the height h of the tower to the nearest on-tenth of metre. Can someone please explain, I'm so lost xD
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Mimi_x3
  • Mimi_x3
idk
anonymous
  • anonymous
oh
Mimi_x3
  • Mimi_x3
Do i work it out by soh cah toa ?

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anonymous
  • anonymous
I'll try it
Mimi_x3
  • Mimi_x3
Okay, btw I asked the question before and someone drew a different diagram to yours xD
anonymous
  • anonymous
really?
anonymous
  • anonymous
this problem is 3 dimensional|dw:1316171303379:dw|
anonymous
  • anonymous
you are right.
Mimi_x3
  • Mimi_x3
Is it 3D ?
anonymous
  • anonymous
from first two diagrams we get AT = h and KT = \[h \sqrt{3}\] so from 3rd figure AT2 + KT2 = 2500 so on simplifying h = 25 m
anonymous
  • anonymous
the first 2 diagrams are 2 dimensional and the 3rd figure is an overhead view
Mimi_x3
  • Mimi_x3
ohh I get it tyvm (:
Mimi_x3
  • Mimi_x3
|dw:1316171761134:dw| Is this right as well ?>
anonymous
  • anonymous
but the two lines below are inclined at 90 degrees to each other in the 3rd dimension
Mimi_x3
  • Mimi_x3
So its wrong ?
anonymous
  • anonymous
the figure is somewhat like .... try cutting a pyramid with a square base from one corner of base to it's opposite corner symmetrically. then u get a figure similar to what we need (not exactly similar but good enough to understand the above problem)
Mimi_x3
  • Mimi_x3
So the figure I drew was wrong ?:
anonymous
  • anonymous
|dw:1316172253129:dw|
Mimi_x3
  • Mimi_x3
oh 3D trig ?
anonymous
  • anonymous
the above figure is possible only in 3d
Mimi_x3
  • Mimi_x3
it can be in 3D ?
anonymous
  • anonymous
no no u don't need 3d trig. just consider each triangle at one time to get the required variables
Mimi_x3
  • Mimi_x3
Okay, but is it necessary though to draw it ?
anonymous
  • anonymous
the whole point is to test whether u can imagine the required diagram once u get the diagram it is easy simplification. u can see that i used the first two diagrams to get the values of AT and KT in terms of h and then used pythagoras theorem in the final triangle. drawing the diagram is important unless u can visualize it exactly to solve the problem in ur head
Mimi_x3
  • Mimi_x3
Okay tyvm (:

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