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→Additional Information
=Additional Information=
=Additional Information=
An ortho-diagonal quadrilateral i.e., any quadrilateral whose diagonals are perpendicular to each other possesses certain interesting properties. This article [http://docs.google.com/viewerng/viewer?url=http://www.teachersofindia.org/sites/default/files/05-shailesh_quadrilaterals.pdf 'Quadrilaterals with Perpendicular Diagonals'] by Shailesh Shirali (published in ''<nowiki/>'At Right Angles''' | Vol. 6, No. 2, August 2017) discusses a few of them.
An ortho-diagonal quadrilateral i.e., any quadrilateral whose diagonals are perpendicular to each other possesses certain interesting properties. This article [http://azimpremjiuniversity.edu.in/SitePages/pdf/quadrilaterals-with-perpendicular-diagonals.pdf 'Quadrilaterals with Perpendicular Diagonals'] by Shailesh Shirali (published in ''<nowiki/>'At Right Angles''' | Vol. 6, No. 2, August 2017) discusses a few of them.
==Useful websites==
==Useful websites==