ଚତୁର୍ଭୁଜ

ଯୁକ୍ଲିଡୀୟ ଜ୍ୟାମିତି ଅନୁସାରେ ଚତୁର୍ଭୁଜ ହେଉଛି, ଚାରି 'ବାହୁ' ଓ ଚାରି 'କୋଣ' ଥିବା ଏକ ବହୁଭୂଜ । ଏହା ସରଳ (କୌଣସି ବାହୁ ପରସ୍ପରକୁ ଛେଦ କରିନଥାନ୍ତି) କିମ୍ବା ଜଟିଳ (କୌଣସି ଦୁଇ ବାହୁ ପରସ୍ପରକୁ ଛେଦ କରିଥାନ୍ତି) ହେଇପାରେ । ସରଳ ଚତୁର୍ଭୁଜ, ଉତ୍ତଳ କିମ୍ବା ଅବତଳ ହେଇପାରେ ।

ଏହାର ଚାରି କୋଣର ସମଷ୍ଟି: $\mathrm{\angle }A+\mathrm{\angle }B+\mathrm{\angle }C+\mathrm{\angle }D=360^{\circ }.$

ବାହାର ଲିଙ୍କ

• ଛାଞ୍ଚ:MathWorld
• Encyclopedia of Quadri-Figures by Chris Van Tienhoven
• Compendium Geometry Analytic Geometry of Quadrilaterals
• Quadrilaterals Formed by Perpendicular Bisectors, Projective Collinearity and Interactive Classification of Quadrilaterals from cut-the-knot
• Definitions and examples of quadrilaterals and Definition and properties of tetragons from Mathopenref
• A (dynamic) Hierarchical Quadrilateral Tree at Dynamic Geometry Sketches
• An extended classification of quadrilaterals ଛାଞ୍ଚ:Webarchive at Dynamic Math Learning Homepage ଛାଞ୍ଚ:Webarchive
• Quadrilateral Venn Diagram ଛାଞ୍ଚ:Webarchive Quadrilaterals expressed in the form of a Venn diagram, where the areas are also the shape of the quadrilateral they describe.
• The role and function of a hierarchical classification of quadrilaterals ଛାଞ୍ଚ:Webarchive by Michael de Villiers