anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Nnesha
  • Nnesha
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Nnesha
  • Nnesha
use the trig ratio to find x \[\rm sin \rm \theta = \frac{ opposite }{ hypotenuse }~~~~ \cos \theta = \frac{ adjacent }{ hypotenuse } ~~\tan \theta = \frac{ opposite }{ adjacent }\]
anonymous
  • anonymous
@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?

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Nnesha
  • Nnesha
yes right then use the calculator to find the exact value
anonymous
  • anonymous
I got .75, is that correct? @Nnesha
Nnesha
  • Nnesha
remember you should inverse tan \[\huge\rm tan( x) =\frac{ 15 }{ 20 }\] \[x= \tan^{-1} \frac{ 15 }{ 20 }\]
Nnesha
  • Nnesha
find*
anonymous
  • anonymous
@Nnesha So the cotangent....? Sorry I just started pre-calc last week so I'm not sure how to do that.
Nnesha
  • Nnesha
tan and cot are `reciprocal` not inverse use the calculator to find inverse tan
anonymous
  • anonymous
@Nnesha So tan(15/20) in the calculator?
Nnesha
  • Nnesha
not tan inverse tan which calculator are u using google or ti84 ?
anonymous
  • anonymous
@Nnesha Oh I figured it out! The final answer is 36.9. Do you mind explaining why I have to find the inverse?
Nnesha
  • Nnesha
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
Nnesha
  • Nnesha
i found this from mathisfun website http://prntscr.com/8e6m50
Nnesha
  • Nnesha
https://www.mathsisfun.com/algebra/trig-inverse-sin-cos-tan.html
anonymous
  • anonymous
@Nnesha Thank you SO much. Your help was amazing!
Nnesha
  • Nnesha
np glad it helped goood work btw! keep it up!

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