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You have already studied several properties of triangles in the previous two chapters.
You’ll now learn about Quadrilaterals. Just like a triangle has three sides, three angles
and three vertices, a quadrilateral is formed when you join four points in some order. A
quadrilateral has four sides, four angles and four vertices.
In this chapter, you’ll learn about various types of quadrilaterals and their properties.
You need to study quadrilaterals because the world around us is full of objects, which
are actually quadrilaterals! Your book, the chessboard, the window of your room,
picture frame, etc. are amongst them.
8.1 Introduction
8.2 Angle Sum Property of a Quadrilateral
8.3 Types of Quadrilaterals
8.4 Properties of a Parallelogram
8.5 Another Condition for a Quadrilateral to be a Parallelogram
8.6 The Mid-point Theorem
8.7 Summary
Section 8.2 – In this section, you’ll learn about the ‘Angle sum property of a
quadrilateral’. You’ll also be able to prove why the sum of the angles of a quadrilateral is
360º.
Section 8.3 – In this section, you’ll learn about different types of Quadrilaterals such as
trapezium, parallelograms, rectangle, rhombus, square and kite. Each type is explained
with figures for better understanding.
Section 8.4 – Parallelogram, which is also a Quadrilateral, has some very interesting
and useful properties. In this chapter, you’ll know all about these properties, as theorems and numerous solved examples are given for you to understand the concepts and theorems clearly.
Section 8.5 – Till now, you have studied various properties of a parallelogram and the
reason why and when a quadrilateral is referred to as a parallelogram. In this section,
you’ll study one more condition that makes quadrilateral a parallelogram.
Section 8.6 – After getting a thorough knowledge of various properties of a triangle as
well as a quadrilateral, now you’ll learn about another result which is related to the
mid-point of sides of a triangle.
To know more about the NCERT Solutions for Class 9 Maths – Chapter 8 Quadrilaterals, you should explore the exercises below. You can also download the NCERT Solutions for Class 9 Maths Chapter 8 PDF, solved by expert maths trainers.
https://www.urbanpro.com/assets/new-ui/sharing_job.pngPublished on 2020-01-29 09:35:09 by arunima. Last Modified on 2020-01-29 09:35:09
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