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anonymous

  • one year ago

Pre-calculus: At a certain time of day, a 15-meter mast casts a 20 meter shadow. What is the angle of elevation of the sun?

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  1. Nnesha
    • one year ago
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    |dw:1441750585833:dw|

  2. Nnesha
    • one year ago
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    use the trig ratio to find x \[\rm sin \rm \theta = \frac{ opposite }{ hypotenuse }~~~~ \cos \theta = \frac{ adjacent }{ hypotenuse } ~~\tan \theta = \frac{ opposite }{ adjacent }\]

  3. anonymous
    • one year ago
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    @Nnesha So I'm doing tan because I know that the opposite is 15, and the adjacent is 20? And that's my answer? 15/20?

  4. Nnesha
    • one year ago
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    yes right then use the calculator to find the exact value

  5. anonymous
    • one year ago
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    I got .75, is that correct? @Nnesha

  6. Nnesha
    • one year ago
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    remember you should inverse tan \[\huge\rm tan( x) =\frac{ 15 }{ 20 }\] \[x= \tan^{-1} \frac{ 15 }{ 20 }\]

  7. Nnesha
    • one year ago
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    find*

  8. anonymous
    • one year ago
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    @Nnesha So the cotangent....? Sorry I just started pre-calc last week so I'm not sure how to do that.

  9. Nnesha
    • one year ago
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    tan and cot are `reciprocal` not inverse use the calculator to find inverse tan

  10. anonymous
    • one year ago
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    @Nnesha So tan(15/20) in the calculator?

  11. Nnesha
    • one year ago
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    not tan inverse tan which calculator are u using google or ti84 ?

  12. anonymous
    • one year ago
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    @Nnesha Oh I figured it out! The final answer is 36.9. Do you mind explaining why I have to find the inverse?

  13. Nnesha
    • one year ago
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    yes that's right tan and invs are opposite like when you have to find side then you should apply tan and when you have to find `an angle ` then you should use invs tan

  14. Nnesha
    • one year ago
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    i found this from mathisfun website http://prntscr.com/8e6m50

  15. Nnesha
    • one year ago
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    https://www.mathsisfun.com/algebra/trig-inverse-sin-cos-tan.html

  16. anonymous
    • one year ago
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    @Nnesha Thank you SO much. Your help was amazing!

  17. Nnesha
    • one year ago
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    np glad it helped goood work btw! keep it up!

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