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Geometry Missing Angles

  1. Mar 6, 2013 #1
    Find the missing angles in each of the following:
     

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  3. Mar 6, 2013 #2

    eumyang

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    Need to show an attempt of these problems. What is the difficulty here?
     
  4. Mar 6, 2013 #3
    Triangle: 180-129= 51
    180-138= 42
    A+51+42= 180
    A= 180-51-42= 87 degrees

    Regular Octagon: (8-2)180/8= 135 degrees
     
  5. Mar 6, 2013 #4
    I am not sure how to find the angles for the other problems
     
  6. Mar 6, 2013 #5

    eumyang

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    Are you familiar with this theorem?
    You can use this for the top right and bottom right problem in your attachment.

    Are you also familiar with supplementary angles?
     
  7. Mar 11, 2013 #6
    180-38-100= 42

    a is corresponding to y
    z is the alternate exterior angle to a
    x is supplementary to a
    105+x= 180
    x= 75
    z= 105

    180-30-70= 80
    < 3= 80
    I am not sure how to solve for < E and < A
     
  8. Mar 11, 2013 #7
    120-180= 60
     
  9. Mar 11, 2013 #8

    eumyang

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    You were also given three pairs of parallel lines. Use that, and the theorem I quoted in post #5, to find angles E and A.
     
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