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From Karnataka Open Educational Resources
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, 03:53, 18 October 2017
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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> |