- Define an interior angle bisector parallelogram siege quadrilateral $ \ $ quadrangular the lambda
- $ \ Lambda $ quadrilateral is a rectangle
- $ \ $ The lambda quadrilateral parallelogram center line
- $ \ Parallel sides and diagonals parallelogram lambda $ quadrilateral
Parallel quadrilateral special properties
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Origin www.cnblogs.com/guoshaoyang/p/11011612.html
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