Parallel quadrilateral special properties

  1. Define an interior angle bisector parallelogram siege quadrilateral $ \ $ quadrangular the lambda
    1. $ \ Lambda $ quadrilateral is a rectangle 
    2. $ \ $ The lambda quadrilateral parallelogram center line
    3. $ \ Parallel sides and diagonals parallelogram lambda $ quadrilateral

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Origin www.cnblogs.com/guoshaoyang/p/11011612.html