Understanding shapes 2 (Quadrilaterals)class8 Class 8 Notes | EduRev

Class 8 : Understanding shapes 2 (Quadrilaterals)class8 Class 8 Notes | EduRev

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Quadrilateral 

Definition-let a, b ,c and d are the four points in a plane such  that-

1. No three of them are collinear

2. The line segment ab BC CD and DA do not intersect except at their and points.


Sides-in a quadrilateral ABCD the four line segment AB, BC , CD and DA  ,are called its side.



Adjecent Sides-Two sides of a quadrilateral are called its adjacent sides , if they have a common end points.




Opposite sides-Two sides of a quadrilateral are called its opposite sides if they do not have a common end point.


Diagonals- In the quadrilateral ABCD the line segment AC and BD are called its diagonal.


Angles- In the quadrilateral ABCD the angles, angle DAB , angle ABC angle BCD and angle CDA are called its angle. These angles are denoted by angle a angle b angle c and angles respectively.



Adjacent angle-two angles of a quadrilateral are called Adjacent angle, is they have a common side as an arm.




Interior and exterior of a quadrilateral.

Understanding shapes 2 (Quadrilaterals)class8 Class 8 Notes | EduRev

Figure 1-shows interior and exterior angle of a quadrilateral.




Convex and concave quadrilateral


Definition-a quadrilateral is called convex quadrilateral if the line containing any side of the quadrilateral has the remaining vertices on the same side of it.



Understanding shapes 2 (Quadrilaterals)class8 Class 8 Notes | EduRev

Figure 2

Convex and concave quadrilateral shows in figure 2






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