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The radius of a circle inscribed in 2 triangles

  1. Apr 14, 2015 #1
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    Hi guys, was wondering if anyone could help me solve this problem. Thanks!
     
  2. jcsd
  3. Apr 14, 2015 #2

    Delta²

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    Have you been taught the concept of similarity of triangles and/or pythagorean theorem or the definition of trigonometric functions? In any case you should show us any attempts you ve made.
     
  4. Apr 14, 2015 #3

    mathman

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    It looks trivial. cos(x)=B/E, sin(x)=r/B. [itex](r/B)^2+(B/E)^2=1,r=B\sqrt{1-(B/E)^2}[/itex]
     
  5. Apr 14, 2015 #4

    Evo

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    Homework in the wrong forum and without the template or attempts at work done should be reported only.
     
  6. Apr 14, 2015 #5
    This isn't school homework which is why I didn't post it here in the first place. Its a problem that I've encountered and was asking for help as I have no idea how to solve it. That's it.
     
  7. Apr 14, 2015 #6
    Thanks for your help mathman, your reply is all I was looking for.
     
  8. Apr 15, 2015 #7

    BruceW

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    you can do this problem by thinking about similar triangles. Have a go at it, think for a bit about the angles of various triangles. If two triangles contain the same angles, then they are similar.
     
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