Parallelogram Theorem:Proving Quadrilateral is a Rhombus

http://www.learncbse.in/ncert-solutions-for-class-9-maths/

In this video, we learn how to apply Congruency Rule to solve Problems on Qudrilaterals. Use parallel lines concept and triangle congruence theorems to prove/solve problems on properties of parallelograms.

Reference book for the above video is

National Council of Educational Research and Training (NCERT) Book for Class 9 Subject: Maths

00:02 CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals q3 ABCD is a rectangle and P, Q, R and S are mid-points of the sides AB, BC, CD and DA respectively. Show that the quadrilateral PQRS is a rhombus.

00:49 Proof

01:03 Consider two triangles and apply mid point theorem.Mid point theorem states that the line segment joining the mid-points of two sides of a triangle is parallel to the third side

01:57 apply mid point theorem.Mid point theorem states that the line segment joining the mid-points of two sides of a triangle is parallel to the third side.

02:33 Use property of parallelgram : Opposite angels are equal & Opposite sides are equal.

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CBSE solutions for class 9 maths Quadrilaterals

CBSE class 9 maths chapter 10 Quadrilaterals

CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals

Solutions for CBSE Class 9 Maths Chapter 10

NCERT solutions for class 9 maths Quadrilaterals

NCERT solutions for CBSE class 9 maths Quadrilaterals

CBSE Class 9 maths solutions Quadrilaterals

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