This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Quadrilateral ABCDE. ar June Transferred from org ar transferred to Commons by User Almuhammedi using de php CommonsHelper Original uploader was Almuhammedi at org ar Released into the public domain by the author ar Almuhammedi Original upload log page ar QuadrilateralABCDE Almuhammedi bytes no Nov Tetragons