Measuring angle of paper folded

Discussion in 'Math' started by RRITESH KAKKAR, Jan 2, 2016.

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  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    A square piece of paper was folded into a pentagon in the following way:
    First we fold the square in a way so that the vertices B and D would go into one point laying on the diagonal AC (see picture 2).
    Then we fold the resulting quadrilateral in a way so that point C would go into point A (see picture 3.)
    What is the measure of the angle with the question mark?

    112.5* answer



    [​IMG]
     
  2. hexreader

    Active Member

    Apr 16, 2011
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    112.5 degrees is correct.
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Is this a puzzle we are supposed to solve without divulging the answer? Or, are you asking how to derive the correct answer? Or, just wondering what the correct answer is? Or, is this just something interesting that you want to share with the rest of us?

    Please give us some direction as to the purpose of this post.

    John
     
  4. JohnInTX

    Moderator

    Jun 26, 2012
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