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Homework Help: The radius of a circle inscribed in 2 triangles

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


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    Homework Helper
    Gold Member

    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


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    Science Advisor

    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


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    Staff: Mentor

    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


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    Homework Helper

    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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