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Unformatted text preview: 95 Quadrilaterals in aPlane A)Quadrilaterala.Let A, B, C and D be four coplanar points. If no three of these points are collinear, and the segments and intersect only at their end points, then the union of the four segments is called a quadrilateralb.ExamplesAi.A B B C C D DAADBCB C DB CEA BC D A DB)Definitionsa.Sidesi.The four segmentsb.Verticesi.The points A, B, C and Dc.Anglesi.The angles and d.Convexi.If no two of its vertices lie on opposite sides of a line containing a side of the quadrilateral. 1.Which one above is not convex? e.Opposite i.Two sides of a quadrilateral are opposite if they do not intersectii.Two of its angles are opposite if they do not have a side of the quadrilateral in commonf.Consecutive i.Two sides are consecutiveif they have a common end pointii.Two angles are consecutive if they have a side of the quadrilateral in common1.Opposite sides2.Opposite angles3.Consecutive sides4.Consecutive anglesg.Diagonal i.Of a quadrilateral is a segment joining two nonconsecutive vertices...
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 Spring '09
 Johnson
 Algebra

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