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Area of Inscribed Equilateral Triangle (some basic trig used)

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Uploaded by on Mar 18, 2010

Problem that requires us to figure out the area of an equilateral triangle inscribed in a circle (A little trigonometry used)

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  • oh boy.. i always had problems because of my lack of basic mathematics knowledge,i was sick for some time,and had to leave math behind,it was a pitty because i loved it.Now is a good time to get back on the black board.Thank you:)

  • you are in 6th grade and haven't studied trigonometry. watch something easier.

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All Comments (20)

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  • @NinjaMinkzx right!!!!

    

  • 1 dislike? Probably american

  • @StavJazzMan I was just about to comment about that!

  • This is SO much easier with 1/2 AB SinX

    because it breaks into 3 angels, so X= 360/3 = 110 degree

    and both A and B are = 2

    so this, multiply by 3, and subtract from area of circle, and you'll get the answer. Easy.

  • It's awesome but it had been rather good if you derived it for standard form

  • @StavJazzMan You don't even need that!

    Use the equilateral triangle formula

    a^2 root 3 over 4

  • too hard, i dont understand

  • you should be an artist with so many colors

  • @mizzagirl217

    this is 9th grade geometry.

  • Forgive my ignorance, but i don't even see why you need trig.

    You have a 30-60-90 triangle, so you can calculate:

    a/2=sqrt3

    a=2(sqrt3)

    And then apply heron's formula to that

    ??????????

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