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=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.
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==Useful websites==
==Useful websites==
# http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here : For effective introduction to quadrilaterals.<br>
# http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here : For effective introduction to quadrilaterals.<br>
