NCERT Textbook- Understanding Quadrilaterals Class 8 Notes | EduRev

Mathematics (Maths) Class 8

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Class 8 : NCERT Textbook- Understanding Quadrilaterals Class 8 Notes | EduRev

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UNDERSTANDING QUADRILATERALS  37
3.1  Introduction
Y ou know that the paper is a model for a plane surface. When you join a number of
points without lifting a pencil from the paper (and without retracing any portion of the
drawing other than single points), you get a plane curve.
Try to recall different varieties of curves you have seen in the earlier classes.
Match the following: (Caution! A figure may match to more than one type).
Figure Type
(1) (a) Simple closed curve
(2) (b) A closed curve that is not simple
(3) (c) Simple curve that is not closed
(4) (d) Not a simple curve
Compare your matchings with those of your friends. Do they agree?
3.2  Polygons
A simple closed curve made up of only line segments is called a polygon.
          
Curves that are polygons Curves that are not polygons
Understanding
Quadrilaterals
CHAPTER
3
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