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Equilateral triangle angles

  1. Jun 1, 2013 #1
    Hi all,

    How would you determine the angle i in the following equilateral triangle.

    O-prism4.png

    Thank you.
     
  2. jcsd
  3. Jun 1, 2013 #2

    tiny-tim

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    Hi Googl! :smile:

    First, find angle C. :wink:
     
  4. Jun 3, 2013 #3
    If ABC and ADC are right angles then
    Compute DBA
    Compute ADB
    Compute angle i
     
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