1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Trig word prob

  1. Dec 28, 2004 #1
    Jennie stands 30 m from the base of a high rise building. The angle of elevation from her eyes to the top of the tower is 70°. How high is the tower if her eyes are 1.8 m above the ground?

    Is the answer to this 82.42 m + 1.8m=84.22 m?
  2. jcsd
  3. Dec 28, 2004 #2
    tan(70) = x/30 = 82.42

    82.42 + 1.8 = 84.22

  4. Dec 28, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    Your first equation doensn't make any logical sense... :grumpy:
    [tex]\tan 70°=\frac{h}{30}\sim 2.747 \Rightarrow h\sim 2.747\cdot 30=82.415m [/tex]
    Total height:approx.84.2 m.


    PS.1.80m to her eyes,almost 1.90m in all:that's a giant *****...!! :tongue2:
  5. Dec 28, 2004 #4
    [tex]Tan \Psi = \frac {Opp}{Adj}[/tex]

    [tex]Tan 70 = \frac {x}{30}[/tex]

    [tex]x = Tan70 \times 30[/tex]

    [tex]x = 82.42[/tex]

    Then add 1.8m becaue of her eye level:

    [tex]y = 82.42 + 1.8[/tex]

    [tex]y = 84.22m[/tex]

    Therefore I say you are right in what you originally said.

    The Bob (2004 ©)

    P.S. Well my eye level is about 1.95m :tongue2:
  6. Jan 22, 2005 #5
    1.9 meters is not a giant...
    its about 6 feet 3 inches...
    im 6' exactly
  7. Jan 23, 2005 #6
    If you check my post above I said that my eye level was about 1.95m (probably more now :tongue2:) and I am not a giant. Just rather tall.

    The Bob (2004 ©)
  8. Jan 23, 2005 #7


    User Avatar
    Science Advisor
    Homework Helper

    Since i'm only 1.71,i feel quite uncomfortable when a lady next to me is towering 20 cm more...Bob,if u were near a girl at 2.15,u'd feel the same way... :tongue2:

  9. Jan 23, 2005 #8
    1.90 meters is very tall for a girl, too tall, in fact. I'd say that she's "deformed."
    Last edited: Jan 23, 2005
  10. Jan 23, 2005 #9
    I most likely would but you find a female 2.15m :tongue2:

    I have met a female almost as tall as me, two infact, and you do wonder why or how. Then you think why or how you are that tall as well.

    The Bob (2004 ©)
  11. Jan 23, 2005 #10
    A little harsh really.

    The Bob (2004 ©)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Trig word prob
  1. Torque prob (Replies: 0)

  2. Thermodynamic prob (Replies: 3)

  3. Spring prob (Replies: 8)