anonymous
  • anonymous
What is the length of side BD? ***Diagram attached below***
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
We can use trig ratios, do you know them?
anonymous
  • anonymous
|dw:1441221685739:dw| we can just work with the pink triangle here

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anonymous
  • anonymous
\[\sin \theta = \frac{ opp }{ hyp }~~~~\tan \theta = \frac{ opp }{ adj }~~~~\cos \theta = \frac{ adj }{ hyp }\] these are your trig ratios, which one can we apply here? |dw:1441221868984:dw|
anonymous
  • anonymous
cosine?
anonymous
  • anonymous
Yes! Now can you set it up?
anonymous
  • anonymous
don't worry about being wrong!
anonymous
  • anonymous
\[\cos 40°=\frac{ adjacent }{ hypotenuse }=\frac{ 20 }{ x }\]
anonymous
  • anonymous
Exactly!
anonymous
  • anonymous
Okay thank you so much! I'll try to solve it now!
anonymous
  • anonymous
Yw :) have fun!

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